Code Line
stringclasses 57
values | User Explanation
stringclasses 692
values | Line-Explanation in PCEX
stringclasses 131
values | Annotation Score
float64 1
5
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while (num % divisor != 0) {
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Loop until a divisor is found.
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We need to increment the divisor repeatedly as long as the divisor is not a factor of the number.
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while (num % divisor != 0) {
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Loop until a divisor is found.
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Therefore, we need to use a loop structure.
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while (num % divisor != 0) {
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Loop until a divisor is found.
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The condition in the while loop tests whether the body of the loop should be repeated, so it should test whether the divisor is not a factor of the number.
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while (num % divisor != 0) {
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Loop until a divisor is found.
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We could check whether the divisor is not a factor of the number by computing the remainder of the division of the number by the divisor.
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divisor += 1;
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Increment divisor by 1 to check if the next number is a divisor.
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When the divisor is not a factor of the number, we increment the variable divisor by 1.
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System.out.println("The smallest divisor of " + num + " is " + divisor);
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Print out the number and its smallest divisor.
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This statement prints to the default standard output stream the smallest divisor of the number.
| 4 |
Scanner scan = new Scanner(System.in);
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Make a new scanner to get input from the user.
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To read the input value from the user, we need to define a Scanner object.
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Scanner scan = new Scanner(System.in);
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Make a new scanner to get input from the user.
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We need to read and process the integer that the user enters.
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System.out.println("Enter an integer: ");
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Ask the user to enter an integer.
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We prompt the user to enter an integer.
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int num = scan.nextInt();
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Get the integer that the user entered.
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We read the input integer by calling the nextInt() method because this input is an integer.
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int num = scan.nextInt();
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Get the integer that the user entered.
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We need to read the integer that the user enters and store it in a variable.
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scan.close();
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Close the scanner since it is not needed any more.
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We close the scanner as we do not want to process any input from the user in the rest of the program.
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if ( num > 0 ) {
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Check if the number is greater than 0.
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If the integer is neither positive nor negative, then we could conclude that the integer is zero.
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if ( num > 0 ) {
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Check if the number is greater than 0.
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The conditions that tests for the integer's sign are mutually exclusive (i.e., one and only one of the conditions can be true); therefore, their order does not matter.
| 1 |
if ( num > 0 ) {
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Check if the number is greater than 0.
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To determine the sign of the integer, we need to perform two tests: one for determining whether the integer is positive and one for determining whether the integer is negative.
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if ( num > 0 ) {
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Check if the number is greater than 0.
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Also, it is better to use if-else if statements instead of sequential if statements because an integer has only one sign and once we find the sign, we don't need to perform more tests.
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if ( num > 0 ) {
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Check if the number is greater than 0.
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If both of these tests fail, then we could conclude that the integer is zero.
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System.out.println("The integer is positivie.");
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Print that the number is positive if it is greater than 0.
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This statement prints that the integer is positive.
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System.out.println("The integer is positivie.");
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Print that the number is positive if it is greater than 0.
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The printed text is followed by the end-of-line character at the end.
| 1 |
} else if ( num < 0 ) {
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Check if the number is less than 0.
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If the first test fails (i.e., when the integer is not positive), we need to test if the integer is negative.
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System.out.println("The integer is negative.");
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Print that the integer is negative if it is less than 0.
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The printed text is followed by the end-of-line character at the end.
| 1 |
System.out.println("The integer is negative.");
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Print that the integer is negative if it is less than 0.
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This statement prints that the integer is negative.
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System.out.println("The integer is positivie.");
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Print that the integer is positive if it is greater than 0.
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This statement prints that the integer is positive.
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System.out.println("The integer is positivie.");
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Print that the integer is positive if it is greater than 0.
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The printed text is followed by the end-of-line character at the end.
| 1 |
} else {
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Check if the number is not less than 0 or greater than 0.
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We need to end the above if-else if statements with an else statement that its body is executed when none of the above tests are true, that is when the integer is zero.
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System.out.println("The integer is zero.");
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Print that the integer is zero if it is not less than 0 or greater than 0.
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The printed text is followed by the end-of-line character at the end.
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System.out.println("The integer is zero.");
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Print that the integer is zero if it is not less than 0 or greater than 0.
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This statement prints that the integer is zero.
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int [] arr = { 1, 2, 3};
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Initialize an array with some values.
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We initialize the array of type int to hold the specified numbers.
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int [] arr = { 1, 2, 3};
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Initialize an array with some values.
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We initialize the array by separating elements with a comma and enclosing the collection in braces { }.
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for ( int i = 0; i < arr.length; i++ ) {
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Loop through all of the elements in the array.
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We want to iterate over the array and increment each element in the array by 1.
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for ( int i = 0; i < arr.length; i++ ) {
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Loop through all of the elements in the array.
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To really change the array as we march across it, we need to use indexes so we can assign an updated value to each position as we go.
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for ( int i = 0; i < arr.length; i++ ) {
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Loop through all of the elements in the array.
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We need the array indexes to start at 0 (array indexes start from 0) with every integer number up to but not including the array length.
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arr[i] += 1;
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Increment the current element in the array by 1.
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This statement increments the element at the index i of the array by 1.
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for (int num = 2; num <= 10; num += 2) {
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Loop through the even positive integers less than or equal to 10.
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To do this, we need to use a loop structure.
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for (int num = 2; num <= 10; num += 2) {
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Loop through the even positive integers less than or equal to 10.
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We need to repeat the same process for each of the even positive integers that are less than or equal to 10.
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for (int num = 2; num <= 10; num += 2) {
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Loop through the even positive integers less than or equal to 10.
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To do this, we initialize variable num to 2, loop until reaching 10 (inclusive), and increment num by 2 after each iteration of the loop.
| 3 |
for (int num = 2; num <= 10; num += 2) {
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Loop through the even positive integers less than or equal to 10.
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We use for loops instead of a while loop because we need to repeat the loop a certain number of times, and for loops are best-suited in cases like this when we know ahead of time the number of times that we need to repeat the loop.
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for (int num = 2; num <= 10; num += 2) {
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Loop through the even positive integers less than or equal to 10.
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Here, we want the for loop to start counting from 2 (2 is the first positive even number) with every even integer number up to (including) 10.
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System.out.println(num + " squared = " + (num * num));
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Print the current integer and its square.
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The multiplication may also be performed directly in the println statement.
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System.out.println(num + " squared = " + (num * num));
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Print the current integer and its square.
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Note that we do not necessarily have to store the squared number in a variable.
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System.out.println(num + " squared = " + (num * num));
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Print the current integer and its square.
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To square each number in the sequence, we multiply it by itself using the multiplication (*) operator.
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System.out.println(num + " squared = " + (num * num));
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Print the current integer and its square.
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In each iteration of the loop, this statement prints the square number to the default standard output stream.
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Point1 point = new Point1();
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Create a new Point1.
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This statement creates a Point1 object using the new keyword and empty parentheses.
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Point1 point = new Point1();
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Create a new Point1.
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The variable point holds a reference to a Point1 object.
| 1 |
point.setX(7);
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Set the x coordinate of the point to 7.
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This statement invokes the method setX of the point to set its x-coordinate to 7.
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point.translate(11, 6);
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Shift the point by +11 in the x direction and +6 in the y direction.
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This statement invokes the method translate of the point.
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point.translate(11, 6);
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Shift the point by +11 in the x direction and +6 in the y direction.
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The second parameter specifies how much we want to shift the y-coordinate of the point.
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point.translate(11, 6);
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Shift the point by +11 in the x direction and +6 in the y direction.
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The translate method receives two parameters.
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point.translate(11, 6);
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Shift the point by +11 in the x direction and +6 in the y direction.
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The first parameter specifies how much we want to shift the x-coordinate of the point.
| 1 |
class Point1 {
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Create a class called Point1.
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We define the class Point1 to represent a point in the Euclidean plane.
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private int y;
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Declare the y coordinate.
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Therefore, we need to declare an instance variable for the class to store the y-coordinate of the point.
| 4 |
private int y;
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Declare the y coordinate.
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We declare it as integer because we want to have integer coordinates for the point.
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private int y;
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Declare the y coordinate.
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Note that an instance variable is a variable defined in a class, for which each instantiated object of the class has a separate copy, or instance.
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private int y;
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Declare the y coordinate.
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Every object of the Point1 class will have its own y-coordinate.
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public void translate(int dx, int dy) {
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Declare the function that shifts the coordinate.
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This method shifts the coordinates by a specific delta-x and delta-y, which are passed as parameters.
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public void translate(int dx, int dy) {
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Declare the function that shifts the coordinate.
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We define this method as public to provide access to this method from outside of the class.
| 1 |
public void translate(int dx, int dy) {
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Declare the function that shifts the coordinate.
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Also, we define its return type as void, as it does not return any value.
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public void translate(int dx, int dy) {
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Declare the function that shifts the coordinate.
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Note that both of the parameters are declared as integers because the point has integer coordinates.
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x += dx;
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Shift the x coordinate by dx.
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To shift the x-coordinate of the point, we need to add dx to the value of the x-coordinate of the point.
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public void setX(int newX) {
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Declare a function that sets the x coordinate.
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Also, we define its return type as void, as it does not return any value.
| 1 |
public void setX(int newX) {
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Declare a function that sets the x coordinate.
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We define this method as public to provide access to this method from outside of the class.
| 1 |
public void setX(int newX) {
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Declare a function that sets the x coordinate.
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This method sets the current value of the x-coordinate of the point to the given value (newX) that is specified as the method's parameter.
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public void setX(int newX) {
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Declare a function that sets the x coordinate.
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Note that the instance variable x is private; thus, it cannot be directly changed from outside the class.
| 1 |
public void setX(int newX) {
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Declare a function that sets the x coordinate.
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The parameter of the method is declared as integer because the x-coordinate of the point is an integer.
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public void setX(int newX) {
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Declare a function that sets the x coordinate.
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It can be changed from outside the class only through this method.
| 1 |
public int getX() {
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Declare a function that gets the current x coordinate.
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We define this method as public to provide access to this method from outside of the class.
| 1 |
public int getX() {
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Declare a function that gets the current x coordinate.
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This method returns the x-coordinate of the point.
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public int getX() {
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Declare a function that gets the current x coordinate.
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Note that the instance variable x is private; thus, it cannot be directly accessed from outside the class.
| 1 |
public int getX() {
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Declare a function that gets the current x coordinate.
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Also, we define its return type as int, as it returns the x-coordinate of the point which is an integer.
| 1 |
public int getX() {
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Declare a function that gets the current x coordinate.
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It can be accessed from outside the class only through this getter method.
| 1 |
System.out.println("The point's coordinates: (" + point.getX() + ", " + point.getY() + ")") ;
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Print out the x and y coordinates.
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Note that we do not necessarily have to store the returned value from each of these methods in a variable.
| 1 |
System.out.println("The point's coordinates: (" + point.getX() + ", " + point.getY() + ")") ;
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Print out the x and y coordinates.
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We could use the returned value of them directly in the println statement.
| 2 |
System.out.println("The point's coordinates: (" + point.getX() + ", " + point.getY() + ")") ;
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Print out the x and y coordinates.
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This statement prints the coordinates of the point to the default standard output stream.
| 4 |
System.out.println("The point's coordinates: (" + point.getX() + ", " + point.getY() + ")") ;
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Print out the x and y coordinates.
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The printed text is followed by the end-of-line character at the end.
| 1 |
System.out.println("The point's coordinates: (" + point.getX() + ", " + point.getY() + ")") ;
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Print out the x and y coordinates.
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To get the point's coordinates, we invoke the method getX and getY of the point.
| 1 |
String fullName = "John Smith"
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Initialize the name to "John Smith."
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We define a string variable to hold the name.
| 3 |
String firstInitial = fullName.substring(0, 1);
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Get the first initial of the name.
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We need to extract the first letter from the first name.
| 4 |
String firstInitial = fullName.substring(0, 1);
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Get the first initial of the name.
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We do this by calling the substring(0,1) method.
| 1 |
String lastInitial = fullName.substring(5, 6);
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Get the last initial of the name.
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We need to extract the first letter from the last name.
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String lastInitial = fullName.substring(5, 6);
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Get the last initial of the name.
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We do this by calling the substring(5,6) method.
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String initials = firstInitial + lastInitial;
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Concatenate the first initial and last initial of the name.
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This statements concatenates the extracted initials and store the result in the string initials.
| 4 |
System.out.println(initials);
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Print out the initials of the name.
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This statement prints the initials to the default standard output stream.
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System.out.println(initials);
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Print out the initials of the name.
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The printed value is followed by the end-of-line character at the end.
| 1 |
int[] values = {5, 8, 4, 78, 95, 12, 1, 0, 6, 35, 46};
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Initialize the array with some values.
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We define array values to hold the specified numbers.
| 4 |
int[] values = {5, 8, 4, 78, 95, 12, 1, 0, 6, 35, 46};
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Initialize the array with some values.
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We initialize the array by separating elements with a comma and enclosing the collection in braces { }.
| 3 |
int maxValue = values[0];
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Initialize the maximum value to the first value in the array.
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We need variable maxValue to store the maximum value of the array.
| 3 |
int maxValue = values[0];
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Initialize the maximum value to the first value in the array.
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We initialize this variable by the first value in the array because we initially assume that the first value is the maximum.
| 4 |
for (int i = 1; i < values.length; i++) {
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Loop through the values in the array other than the first value.
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We use a for loop to iterate over the remaining array indexes and search for the maximum value.
| 4 |
for (int i = 1; i < values.length; i++) {
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Loop through the values in the array other than the first value.
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We need the array indexes to start at 1 with every integer number up to but not including the array length.
| 3 |
if (values[i] > maxValue) {
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Check if the current value is greater than the maximum value seen so far.
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We need to compare the value at the index i of the array with the maximum value stored in variable maxValue.
| 3 |
if (values[i] > maxValue) {
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Check if the current value is greater than the maximum value seen so far.
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If the value at that index is larger than the maximum value, then we need to set the maximum value to the value of the element at index i.
| 2 |
maxValue = values[i];
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Set the maximum value to the current value.
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This statement sets the maximum value to value of the element at index i of the array.
| 4 |
System.out.println("Maximum value: " + maxValue);
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Print out the maximum value.
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This statement prints the maximum value of the array to the default standard output stream.
| 5 |
Scanner scan = new Scanner(System.in);
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Creates a scanner object to receive user inputs
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To read the input value from the user, we need to define a Scanner object.
| 5 |
Scanner scan = new Scanner(System.in);
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Creates a scanner object to receive user inputs
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We need to read and process the value that the user enters.
| 3 |
int num = 1234;
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This line initializes the integer "num" which is the number that will have it's digits printed.
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We need variable num to store the integer that we want to print its digits.
| 4 |
do {
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This line starts the do-while loop.
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We need to process the digits of the integer from right to left and print them.
| 1 |
do {
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This line starts the do-while loop.
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Therefore, we need to use a loop structure.
| 3 |
do {
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This line starts the do-while loop.
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In this program, we do this by using a do loop.
| 4 |
do {
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This line starts the do-while loop.
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The do loop is more appropriate than a while loop because a positive integer always has at least one digit which results in the body of the loop performing at least once.
| 2 |
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