Datasets:
xap
/
SelfCode

Dataset card Data Studio Files Community
1
Code Line
stringclasses
57 values
User Explanation
stringclasses
692 values
Line-Explanation in PCEX
stringclasses
131 values
Annotation Score
float64
1
5
⌀
} while (num > 0);
Break once we've removed all the digits in the number
We need to check for termination conditions to avoid infinite loops.
1
} while (num > 0);
Break once we've removed all the digits in the number
The loop should terminate when we run out of digits to process.
3
} while (num > 0);
Break once we've removed all the digits in the number
We could check whether the are more digits left by checking whether the variable num, which gets updated in the body of the do loop, is greater than zero.
1
} while (num > 0);
Break once we've removed all the digits in the number
If variable num is greater than zero, then it must have at least one digit, and in that case, the body of the do loop will be repeated again.
1
} while (num > 0);
Break once we've removed all the digits in the number
The body of the while loop should repeat as long as there are more digits left that we have not processed yet.
3
Scanner scan = new Scanner(System.in);
Set up a scanner to read in user inputs
To read the input values from the user, we need to define a Scanner object.
4
Scanner scan = new Scanner(System.in);
Set up a scanner to read in user inputs
We need to read and process the values that the user enters.
3
System.out.println("Enter the phone age in years:");
Prompt the user to input the phone age
We prompt the user to enter the phone age in years.
4
int phoneAge = scan.nextInt();
Read in the user's input as an integer
We read the phone age by calling the nextInt() method because this input is an integer.
3
int phoneAge = scan.nextInt();
Read in the user's input as an integer
We need to read the phone age that the user enters and store it in a variable.
3
System.out.println("Enter whether the phone is broken (true or false):");
Prompt the user to input whether the phone is broken or not
We prompt the user to enter whether the phone is broken.
4
boolean isBroken = scan.nextBoolean();
Read in the user's input as to whether the phone is broken
We need to read whether the phone is broken and store it in a variable.
3
boolean isBroken = scan.nextBoolean();
Read in the user's input as to whether the phone is broken
The variable isBroken is true when the phone is broken, and false otherwise.
1
boolean isBroken = scan.nextBoolean();
Read in the user's input as to whether the phone is broken
We read whether the phone is broken by calling the nextBoolean() method because this input is a boolean.
2
scan.close();
Stop reading in user inputs
We close the scanner as we do not want to process any input from the user in the rest of the program.
2
boolean needPhone = isBroken || phoneAge >= 3;
Find out if the phone is broken or if it is too old using the logical or operator
We use the || operator (called or) to combine the two conditions.
3
boolean needPhone = isBroken || phoneAge >= 3;
Find out if the phone is broken or if it is too old using the logical or operator
The first condition is to test if the phone is broken and the second condition is to test if the phone age is at least 3 years old.
3
boolean needPhone = isBroken || phoneAge >= 3;
Find out if the phone is broken or if it is too old using the logical or operator
We need two conditions to determine if it is the time for a new phone.
3
System.out.println(needPhone);
Tell the user whether they need a new phone or not
This statement prints true/false depending on whether it is time to buy a new phone.
3
System.out.println(needPhone);
Tell the user whether they need a new phone or not
The printed value is followed by an end-of-line character in the end.
1
for (int num = 2; num <= 10; num += 2) {
Go through all even integers starting at two and ending at ten
To do this, we need to use a loop structure.
1
for (int num = 2; num <= 10; num += 2) {
Go through all even integers starting at two and ending at ten
We need to repeat the same process for each of the even positive integers that are less than or equal to 10.
2
for (int num = 2; num <= 10; num += 2) {
Go through all even integers starting at two and ending at ten
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) {
Go through all even integers starting at two and ending at ten
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) {
Go through all even integers starting at two and ending at ten
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.
2
System.out.println(num + " squared = " + (num * num));
Print out the square of the current even integer
The multiplication may also be performed directly in the println statement.
1
System.out.println(num + " squared = " + (num * num));
Print out the square of the current even integer
Note that we do not necessarily have to store the squared number in a variable.
1
System.out.println(num + " squared = " + (num * num));
Print out the square of the current even integer
To square each number in the sequence, we multiply it by itself using the multiplication (*) operator.
1
System.out.println(num + " squared = " + (num * num));
Print out the square of the current even integer
In each iteration of the loop, this statement prints the square number to the default standard output stream.
3
Point1 point = new Point1();
Generate an instance of the Point class
This statement creates a Point1 object using the new keyword and empty parentheses.
3
Point1 point = new Point1();
Generate an instance of the Point class
The variable point holds a reference to a Point1 object.
2
point.setX(7);
Set the x value in this point class
This statement invokes the method setX of the point to set its x-coordinate to 7.
3
point.translate(11, 6);
Move the point by 11 in the x direction and 6 in the y direction
This statement invokes the method translate of the point.
2
point.translate(11, 6);
Move the point by 11 in the x direction and 6 in the y direction
The second parameter specifies how much we want to shift the y-coordinate of the point.
2
point.translate(11, 6);
Move the point by 11 in the x direction and 6 in the y direction
The translate method receives two parameters.
2
point.translate(11, 6);
Move the point by 11 in the x direction and 6 in the y direction
The first parameter specifies how much we want to shift the x-coordinate of the point.
2
System.out.println("The point's coordinates: (" + point.getX() + ", " + point.getY() + ")") ;
Print out the new coordinates of the point after translation by using the getters of the class
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() + ")") ;
Print out the new coordinates of the point after translation by using the getters of the class
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() + ")") ;
Print out the new coordinates of the point after translation by using the getters of the class
This statement prints the coordinates of the point to the default standard output stream.
3
System.out.println("The point's coordinates: (" + point.getX() + ", " + point.getY() + ")") ;
Print out the new coordinates of the point after translation by using the getters of the class
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() + ")") ;
Print out the new coordinates of the point after translation by using the getters of the class
To get the point's coordinates, we invoke the method getX and getY of the point.
3
class Point1 {
Declare a new class called Point1
We define the class Point1 to represent a point in the Euclidean plane.
3
private int y;
Store the y value of the point
Therefore, we need to declare an instance variable for the class to store the y-coordinate of the point.
2
private int y;
Store the y value of the point
We declare it as integer because we want to have integer coordinates for the point.
1
private int y;
Store the y value of the point
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.
1
private int y;
Store the y value of the point
Every object of the Point1 class will have its own y-coordinate.
2
public void translate(int dx, int dy) {
Define a method for the class to translate the point by a certain amount in the x and y direction
This method shifts the coordinates by a specific delta-x and delta-y, which are passed as parameters.
3
public void translate(int dx, int dy) {
Define a method for the class to translate the point by a certain amount in the x and y direction
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) {
Define a method for the class to translate the point by a certain amount in the x and y direction
Also, we define its return type as void, as it does not return any value.
1
public void translate(int dx, int dy) {
Define a method for the class to translate the point by a certain amount in the x and y direction
Note that both of the parameters are declared as integers because the point has integer coordinates.
1
x += dx;
Move the point by the incoming dx value
To shift the x-coordinate of the point, we need to add dx to the value of the x-coordinate of the point.
3
x += dx;
Increment the point by the dx value
To shift the x-coordinate of the point, we need to add dx to the value of the x-coordinate of the point.
3
public void setX(int newX) {
Define a method to set a value for the point's x value
Also, we define its return type as void, as it does not return any value.
1
public void setX(int newX) {
Define a method to set a value for the point's x value
We define this method as public to provide access to this method from outside of the class.
1
public void setX(int newX) {
Define a method to set a value for the point's x value
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.
2
public void setX(int newX) {
Define a method to set a value for the point's x value
Note that the instance variable x is private; thus, it cannot be directly changed from outside the class.
1
public void setX(int newX) {
Define a method to set a value for the point's x value
The parameter of the method is declared as integer because the x-coordinate of the point is an integer.
1
public void setX(int newX) {
Define a method to set a value for the point's x value
It can be changed from outside the class only through this method.
1
public int getX() {
Define a method to get the current x coordinate of the point
We define this method as public to provide access to this method from outside of the class.
2
public int getX() {
Define a method to get the current x coordinate of the point
This method returns the x-coordinate of the point.
2
public int getX() {
Define a method to get the current x coordinate of the point
Note that the instance variable x is private; thus, it cannot be directly accessed from outside the class.
2
public int getX() {
Define a method to get the current x coordinate of the point
Also, we define its return type as int, as it returns the x-coordinate of the point which is an integer.
2
public int getX() {
Define a method to get the current x coordinate of the point
It can be accessed from outside the class only through this getter method.
2
Scanner scan = new Scanner(System.in);
creates a new Scanner instance which points to the input stream passed as argument.
To read the input value from the user, we need to define a Scanner object.
4
Scanner scan = new Scanner(System.in);
creates a new Scanner instance which points to the input stream passed as argument.
We need to read and process the integer that the user enters.
1
System.out.println("Enter an integer: ");
this code line prints the text "Enter an integer: "
We prompt the user to enter an integer.
5
int num = scan.nextInt();
This code line creates the integer called num and gives to it the value of the input number
We read the input integer by calling the nextInt() method because this input is an integer.
3
int num = scan.nextInt();
This code line creates the integer called num and gives to it the value of the input number
We need to read the integer that the user enters and store it in a variable.
3
if ( num > 0 ) {
It's a if cycle, it does what is after the brace if the integer "num" is greater than 0
If the integer is neither positive nor negative, then we could conclude that the integer is zero.
1
if ( num > 0 ) {
It's a if cycle, it does what is after the brace if the integer "num" is greater than 0
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 ) {
It's a if cycle, it does what is after the brace if the integer "num" is greater than 0
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 ) {
It's a if cycle, it does what is after the brace if the integer "num" is greater than 0
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 ) {
It's a if cycle, it does what is after the brace if the integer "num" is greater than 0
If both of these tests fail, then we could conclude that the integer is zero.
1
System.out.println("The integer is positivie.");
This code line prints the text "The integer is positive."
This statement prints that the integer is positive.
5
System.out.println("The integer is positivie.");
This code line prints the text "The integer is positive."
The printed text is followed by the end-of-line character at the end.
1
} else if ( num < 0 ) {
It's a else if statement. If the the integer "num" is smaller than 0 it does the instructions after the brace.
If the first test fails (i.e., when the integer is not positive), we need to test if the integer is negative.
2
System.out.println("The integer is negative.");
This code line prints the text "The integer is negative."
The printed text is followed by the end-of-line character at the end.
1
System.out.println("The integer is negative.");
This code line prints the text "The integer is negative."
This statement prints that the integer is negative.
5
} else {
It's a else statement. If the integer "num" it's not greater or smaller than 0 (so it's equal to zero) it does the instructions after the brace.
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.
2
System.out.println("The integer is zero.");
This code line prints the text "The integer is zero."
The printed text is followed by the end-of-line character at the end.
2
System.out.println("The integer is zero.");
This code line prints the text "The integer is zero."
This statement prints that the integer is zero.
5
System.out.println("The integer is zero.");
This code line prints the text "The integer is zero."
The printed text is followed by the end-of-line character at the end.
1
System.out.println("The integer is zero.");
This code line prints the text "The integer is zero."
This statement prints that the integer is zero.
5
scan.close();
It closes this scanner.
We close the scanner as we do not want to process any input from the user in the rest of the program.
3
int [] arr = { 1, 2, 3};
It declares an Array of integers.
We initialize the array of type int to hold the specified numbers.
3
int [] arr = { 1, 2, 3};
It declares an Array of integers.
We initialize the array by separating elements with a comma and enclosing the collection in braces { }.
2
for ( int i = 0; i < arr.length; i++ ) {
It's a for cycle.
We want to iterate over the array and increment each element in the array by 1.
1
for ( int i = 0; i < arr.length; i++ ) {
It's a for cycle.
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++ ) {
It's a for cycle.
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
for ( int i = 0; i < arr.length; i++ ) {
It does the instructions after the brace as long as the integer i is smallar than the length of the array.
We want to iterate over the array and increment each element in the array by 1.
1
for ( int i = 0; i < arr.length; i++ ) {
It does the instructions after the brace as long as the integer i is smallar than the length of the array.
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++ ) {
It does the instructions after the brace as long as the integer i is smallar than the length of the array.
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.
2
for ( int i = 0; i < arr.length; i++ ) {
After every cycle increment the value of i of 1.
We want to iterate over the array and increment each element in the array by 1.
4
for ( int i = 0; i < arr.length; i++ ) {
After every cycle increment the value of i of 1.
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.
2
for ( int i = 0; i < arr.length; i++ ) {
After every cycle increment the value of i of 1.
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.
3
arr[i] += 1;
Increment the value of the i-element of the array by 1.
This statement increments the element at the index i of the array by 1.
4
Scanner scan = new Scanner(System.in);
Creating a scanner variable that is used to take input from the user.
To read the input value from the user, we need to define a Scanner object.
3
Scanner scan = new Scanner(System.in);
Creating a scanner variable that is used to take input from the user.
We need to read and process the value that the user enters.
4
System.out.println("Enter an integer for seconds: ");
Printing a prompt asking for user input
We prompt the user to enter the seconds.
5
int seconds = scan.nextInt();
Using the scanner variable created before to take input from user.
We need to read the seconds that the user enters and store it in a variable.
3