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for (int num = 2; num <= 10; num += 2) { | Since num must be <= 10 to execute what code is in the body of the function, the code in the body will execute for num = 10 as well. | 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. | 2 |
for (int num = 2; num <= 10; num += 2) { | Since num must be <= 10 to execute what code is in the body of the function, the code in the body will execute for num = 10 as well. | 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. | 1 |
for (int num = 2; num <= 10; num += 2) { | Since num must be <= 10 to execute what code is in the body of the function, the code in the body will execute for num = 10 as well. | 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. | 3 |
int minutes = seconds / 60; | Create the variable minutes | To obtain the minutes in seconds, we divide the seconds by 60 because there are 60 seconds in a minute. | 2 |
int minutes = seconds / 60; | Create the variable minutes | Note that since both operands of division operator are integer, the fractional part of the result is truncated, if there is any. | 1 |
int remainingSeconds = seconds % 60; | Stores the missing seconds | This is because there are 60 seconds in a minute. | 1 |
int remainingSeconds = seconds % 60; | Stores the missing seconds | Note that the % operator returns the remainder of the division. | 1 |
int remainingSeconds = seconds % 60; | Stores the missing seconds | To obtain the remaining seconds after taking away the minutes, we have to take the remainder of the seconds divided by 60. | 1 |
System.out.println(seconds + " seconds is " + minutes + " minutes and " + remainingSeconds + " seconds."); | Output | This statement prints to the default standard output stream the minutes and remaining seconds from the input amount of time in seconds. | 2 |
System.out.println(seconds + " seconds is " + minutes + " minutes and " + remainingSeconds + " seconds."); | Output | The printed text is followed by the end-of-line character at the end. | 1 |
int num = 15; | Creates the variable num | We define variable num to store the number that we want to find its smallest divisor. | 3 |
int num = 15; | Creates the variable num | We could initialize it to any positive integer greater than 1. | 1 |
int num = 15; | Creates the variable num | In this program, we initialize variable num to 15. | 2 |
System.out.println(num + " squared = " + (num * num)); | This code will print what the current num is and its squared value. | The multiplication may also be performed directly in the println statement. | 1 |
System.out.println(num + " squared = " + (num * num)); | This code will print what the current num is and its squared value. | Note that we do not necessarily have to store the squared number in a variable. | 1 |
System.out.println(num + " squared = " + (num * num)); | This code will print what the current num is and its squared value. | To square each number in the sequence, we multiply it by itself using the multiplication (*) operator. | 2 |
System.out.println(num + " squared = " + (num * num)); | This code will print what the current num is and its squared value. | In each iteration of the loop, this statement prints the square number to the default standard output stream. | 3 |
System.out.println(num + " squared = " + (num * num)); | For instance, if num is 4 it will print "4 squared = 16". | The multiplication may also be performed directly in the println statement. | 1 |
System.out.println(num + " squared = " + (num * num)); | For instance, if num is 4 it will print "4 squared = 16". | Note that we do not necessarily have to store the squared number in a variable. | 1 |
System.out.println(num + " squared = " + (num * num)); | For instance, if num is 4 it will print "4 squared = 16". | To square each number in the sequence, we multiply it by itself using the multiplication (*) operator. | 1 |
System.out.println(num + " squared = " + (num * num)); | For instance, if num is 4 it will print "4 squared = 16". | In each iteration of the loop, this statement prints the square number to the default standard output stream. | 2 |
int divisor = 2; | Creates the variable divisor | We initialize variable divisor by 2 because we want to find the smallest divisor except 1. | 2 |
int divisor = 2; | Creates the variable divisor | We define variable divisor to store the smallest divisor of the number. | 3 |
while (num % divisor != 0) { | Loop start | Since we don't know ahead of time how many times the loop will be repeated, we need to use a while loop. | 2 |
while (num % divisor != 0) { | Loop start | We need to increment the divisor repeatedly as long as the divisor is not a factor of the number. | 1 |
while (num % divisor != 0) { | Loop start | Therefore, we need to use a loop structure. | 2 |
while (num % divisor != 0) { | Loop start | 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. | 1 |
while (num % divisor != 0) { | Loop start | 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. | 1 |
divisor += 1; | Find the new divisor | When the divisor is not a factor of the number, we increment the variable divisor by 1. | 2 |
scan.close(); | Closes the entrance | We close the scanner as we do not want to process any input from the user in the rest of the program. | 2 |
System.out.println("The smallest divisor of " + num + " is " + divisor); | Output | This statement prints to the default standard output stream the smallest divisor of the number. | 2 |
Point1 point = new Point1(); | This line instantiates a brand new Point1 object. | This statement creates a Point1 object using the new keyword and empty parentheses. | 3 |
Point1 point = new Point1(); | This line instantiates a brand new Point1 object. | The variable point holds a reference to a Point1 object. | 2 |
Scanner scan = new Scanner(System.in); | Set input start | To read the input value from the user, we need to define a Scanner object. | 2 |
Scanner scan = new Scanner(System.in); | Set input start | We need to read and process the integer that the user enters. | 2 |
System.out.println("Enter an integer: "); | Prints the phrase "Enter an integer:" | We prompt the user to enter an integer. | 4 |
int num = scan.nextInt(); | Creates the variable "num" | We read the input integer by calling the nextInt() method because this input is an integer. | 1 |
int num = scan.nextInt(); | Creates the variable "num" | We need to read the integer that the user enters and store it in a variable. | 2 |
point.setX(7); | This sets the x variable defined by the Point1 object to 7. | This statement invokes the method setX of the point to set its x-coordinate to 7. | 4 |
scan.close(); | Close input | We close the scanner as we do not want to process any input from the user in the rest of the program. | 2 |
if ( num > 0 ) { | Finds "num" greater than zero | If the integer is neither positive nor negative, then we could conclude that the integer is zero. | 1 |
if ( num > 0 ) { | Finds "num" greater than zero | 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 ) { | Finds "num" greater than zero | 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. | 1 |
if ( num > 0 ) { | Finds "num" greater than zero | 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. | 1 |
if ( num > 0 ) { | Finds "num" greater than zero | If both of these tests fail, then we could conclude that the integer is zero. | 1 |
System.out.println("The integer is positivie."); | Prints if the number is positive | This statement prints that the integer is positive. | 4 |
System.out.println("The integer is positivie."); | Prints if the number is positive | The printed text is followed by the end-of-line character at the end. | 1 |
} else if ( num < 0 ) { | Finds "num" less than zero | If the first test fails (i.e., when the integer is not positive), we need to test if the integer is negative. | 2 |
point.translate(11, 6); | This increments the x variable from the Point1 object by 11 and also increments the y variable by 6. | This statement invokes the method translate of the point. | 2 |
point.translate(11, 6); | This increments the x variable from the Point1 object by 11 and also increments the y variable by 6. | The second parameter specifies how much we want to shift the y-coordinate of the point. | 2 |
point.translate(11, 6); | This increments the x variable from the Point1 object by 11 and also increments the y variable by 6. | The translate method receives two parameters. | 1 |
point.translate(11, 6); | This increments the x variable from the Point1 object by 11 and also increments the y variable by 6. | The first parameter specifies how much we want to shift the x-coordinate of the point. | 2 |
System.out.println("The integer is negative."); | Output if the number is negative | The printed text is followed by the end-of-line character at the end. | 1 |
System.out.println("The integer is negative."); | Output if the number is negative | This statement prints that the integer is negative. | 5 |
Scanner scan = new Scanner(System.in); | introduce a new input scanner named "scan" | To read the input value from the user, we need to define a Scanner object. | 4 |
Scanner scan = new Scanner(System.in); | introduce a new input scanner named "scan" | We need to read and process the value that the user enters. | 2 |
} else { | If it is not negative or positive | 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. | 3 |
System.out.println("The integer is zero."); | Prints that the number is equal to 0 | The printed text is followed by the end-of-line character at the end. | 1 |
System.out.println("The integer is zero."); | Prints that the number is equal to 0 | This statement prints that the integer is zero. | 5 |
System.out.println("Enter an integer for seconds: "); | Ask the user to input an integer for seconds | We prompt the user to enter the seconds. | 5 |
int [] arr = { 1, 2, 3}; | Creates the variable "arr" | We initialize the array of type int to hold the specified numbers. | 1 |
int [] arr = { 1, 2, 3}; | Creates the variable "arr" | We initialize the array by separating elements with a comma and enclosing the collection in braces { }. | 1 |
System.out.println("The point's coordinates: (" + point.getX() + ", " + point.getY() + ")") ; | This prints out the current point1 object's x and y variables by using .getX and .getY functions that return the data stored in those variables. | Note that we do not necessarily have to store the returned value from each of these methods in a variable. | 2 |
System.out.println("The point's coordinates: (" + point.getX() + ", " + point.getY() + ")") ; | This prints out the current point1 object's x and y variables by using .getX and .getY functions that return the data stored in those variables. | 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() + ")") ; | This prints out the current point1 object's x and y variables by using .getX and .getY functions that return the data stored in those variables. | 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() + ")") ; | This prints out the current point1 object's x and y variables by using .getX and .getY functions that return the data stored in those variables. | The printed text is followed by the end-of-line character at the end. | 2 |
System.out.println("The point's coordinates: (" + point.getX() + ", " + point.getY() + ")") ; | This prints out the current point1 object's x and y variables by using .getX and .getY functions that return the data stored in those variables. | To get the point's coordinates, we invoke the method getX and getY of the point. | 4 |
System.out.println("The point's coordinates: (" + point.getX() + ", " + point.getY() + ")") ; | This prints out the current point1 object's x and y variables by using .getX and .getY functions that return the data stored in those variables. | 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() + ")") ; | This prints out the current point1 object's x and y variables by using .getX and .getY functions that return the data stored in those variables. | 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() + ")") ; | This prints out the current point1 object's x and y variables by using .getX and .getY functions that return the data stored in those variables. | 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() + ")") ; | This prints out the current point1 object's x and y variables by using .getX and .getY functions that return the data stored in those variables. | The printed text is followed by the end-of-line character at the end. | 2 |
System.out.println("The point's coordinates: (" + point.getX() + ", " + point.getY() + ")") ; | This prints out the current point1 object's x and y variables by using .getX and .getY functions that return the data stored in those variables. | To get the point's coordinates, we invoke the method getX and getY of the point. | 4 |
int seconds = scan.nextInt(); | set user input to int named "seconds" | We need to read the seconds that the user enters and store it in a variable. | 4 |
int seconds = scan.nextInt(); | set user input to int named "seconds" | We read the seconds by calling the nextInt() method because this input is an integer. | 2 |
arr[i] += 1; | New value of "arr" | This statement increments the element at the index i of the array by 1. | 1 |
for ( int i = 0; i < arr.length; i++ ) { | Loop start | We want to iterate over the array and increment each element in the array by 1. | 2 |
for ( int i = 0; i < arr.length; i++ ) { | Loop start | 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. | 1 |
for ( int i = 0; i < arr.length; i++ ) { | Loop start | 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. | 1 |
scan.close(); | stop the scan input function | We close the scanner as we do not want to process any input from the user in the rest of the program. | 2 |
int minutes = seconds / 60; | define integer "minutes" as "seconds" divided by 60 | To obtain the minutes in seconds, we divide the seconds by 60 because there are 60 seconds in a minute. | 4 |
int minutes = seconds / 60; | define integer "minutes" as "seconds" divided by 60 | Note that since both operands of division operator are integer, the fractional part of the result is truncated, if there is any. | 1 |
for (int num = 2; num <= 10; num += 2) { | Num will be set to two and incremented by 2 (guaranteeing even values) after the for loop executes the body in the code each time, until num reaches 10. | To do this, we need to use a loop structure. | 2 |
for (int num = 2; num <= 10; num += 2) { | Num will be set to two and incremented by 2 (guaranteeing even values) after the for loop executes the body in the code each time, until num reaches 10. | We need to repeat the same process for each of the even positive integers that are less than or equal to 10. | 4 |
for (int num = 2; num <= 10; num += 2) { | Num will be set to two and incremented by 2 (guaranteeing even values) after the for loop executes the body in the code each time, until num reaches 10. | 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. | 4 |
for (int num = 2; num <= 10; num += 2) { | Num will be set to two and incremented by 2 (guaranteeing even values) after the for loop executes the body in the code each time, until num reaches 10. | 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. | 2 |
for (int num = 2; num <= 10; num += 2) { | Num will be set to two and incremented by 2 (guaranteeing even values) after the for loop executes the body in the code each time, until num reaches 10. | 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. | 3 |
int remainingSeconds = seconds % 60; | define the remainder of seconds/60 as "remainingSeconds" integer | This is because there are 60 seconds in a minute. | 1 |
int remainingSeconds = seconds % 60; | define the remainder of seconds/60 as "remainingSeconds" integer | Note that the % operator returns the remainder of the division. | 2 |
int remainingSeconds = seconds % 60; | define the remainder of seconds/60 as "remainingSeconds" integer | To obtain the remaining seconds after taking away the minutes, we have to take the remainder of the seconds divided by 60. | 3 |
System.out.println(num + " squared = " + (num * num)); | This line prints the current value of num and its squared value, for instance if num = 4, it will print "4.squared = 16" | The multiplication may also be performed directly in the println statement. | 1 |
System.out.println(num + " squared = " + (num * num)); | This line prints the current value of num and its squared value, for instance if num = 4, it will print "4.squared = 16" | Note that we do not necessarily have to store the squared number in a variable. | 1 |
System.out.println(num + " squared = " + (num * num)); | This line prints the current value of num and its squared value, for instance if num = 4, it will print "4.squared = 16" | To square each number in the sequence, we multiply it by itself using the multiplication (*) operator. | 3 |
System.out.println(num + " squared = " + (num * num)); | This line prints the current value of num and its squared value, for instance if num = 4, it will print "4.squared = 16" | In each iteration of the loop, this statement prints the square number to the default standard output stream. | 4 |
System.out.println(num + " squared = " + (num * num)); | This line prints the current value of num and its squared value, for instance if num = 4, it will print "4.squared = 16" | The multiplication may also be performed directly in the println statement. | 1 |
System.out.println(num + " squared = " + (num * num)); | This line prints the current value of num and its squared value, for instance if num = 4, it will print "4.squared = 16" | Note that we do not necessarily have to store the squared number in a variable. | 1 |
System.out.println(num + " squared = " + (num * num)); | This line prints the current value of num and its squared value, for instance if num = 4, it will print "4.squared = 16" | To square each number in the sequence, we multiply it by itself using the multiplication (*) operator. | 3 |
System.out.println(num + " squared = " + (num * num)); | This line prints the current value of num and its squared value, for instance if num = 4, it will print "4.squared = 16" | In each iteration of the loop, this statement prints the square number to the default standard output stream. | 3 |
System.out.println(seconds + " seconds is " + minutes + " minutes and " + remainingSeconds + " seconds."); | output the integers to the user | This statement prints to the default standard output stream the minutes and remaining seconds from the input amount of time in seconds. | 3 |
System.out.println(seconds + " seconds is " + minutes + " minutes and " + remainingSeconds + " seconds."); | output the integers to the user | The printed text is followed by the end-of-line character at the end. | 1 |
Point1 point = new Point1(); | This line instantiates a new Point1 object named point. | This statement creates a Point1 object using the new keyword and empty parentheses. | 4 |
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