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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Point1 point = new Point1();
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This line instantiates a new Point1 object named point.
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The variable point holds a reference to a Point1 object.
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int num = 15;
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define integer "num" as 15
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We define variable num to store the number that we want to find its smallest divisor.
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int num = 15;
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define integer "num" as 15
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We could initialize it to any positive integer greater than 1.
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int num = 15;
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define integer "num" as 15
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In this program, we initialize variable num to 15.
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point.setX(7);
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This line sets the variable x within the Point1 object 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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int divisor = 2;
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define integer "divisor" as 2
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We initialize variable divisor by 2 because we want to find the smallest divisor except 1.
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int divisor = 2;
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define integer "divisor" as 2
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We define variable divisor to store the smallest divisor of the number.
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point.translate(11, 6);
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This line increments the variable x within the Point1 object by 11 and the y variable by 6.
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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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This line increments the variable x within the Point1 object by 11 and the y variable by 6.
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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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This line increments the variable x within the Point1 object by 11 and the y variable by 6.
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The translate method receives two parameters.
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point.translate(11, 6);
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This line increments the variable x within the Point1 object by 11 and the y variable by 6.
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The first parameter specifies how much we want to shift the x-coordinate of the point.
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System.out.println("The point's coordinates: (" + point.getX() + ", " + point.getY() + ")") ;
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This prints the current value of the x and y variables within the Point1 object.
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Note that we do not necessarily have to store the returned value from each of these methods in a variable.
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System.out.println("The point's coordinates: (" + point.getX() + ", " + point.getY() + ")") ;
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This prints the current value of the x and y variables within the Point1 object.
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We could use the returned value of them directly in the println statement.
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System.out.println("The point's coordinates: (" + point.getX() + ", " + point.getY() + ")") ;
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This prints the current value of the x and y variables within the Point1 object.
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This statement prints the coordinates of the point to the default standard output stream.
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System.out.println("The point's coordinates: (" + point.getX() + ", " + point.getY() + ")") ;
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This prints the current value of the x and y variables within the Point1 object.
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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 point's coordinates: (" + point.getX() + ", " + point.getY() + ")") ;
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This prints the current value of the x and y variables within the Point1 object.
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To get the point's coordinates, we invoke the method getX and getY of the point.
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class Point1 {
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This defines the class Point1.
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We define the class Point1 to represent a point in the Euclidean plane.
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class Point1 {
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Everything that follows after the opening bracket is part of the Point1 class (until closing bracket).
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We define the class Point1 to represent a point in the Euclidean plane.
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while (num % divisor != 0) {
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run a while-loop as long as the remainder of num/divisor is not equal to 0
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Since we don't know ahead of time how many times the loop will be repeated, we need to use a while loop.
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while (num % divisor != 0) {
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run a while-loop as long as the remainder of num/divisor is not equal to 0
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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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run a while-loop as long as the remainder of num/divisor is not equal to 0
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Therefore, we need to use a loop structure.
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while (num % divisor != 0) {
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run a while-loop as long as the remainder of num/divisor is not equal to 0
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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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run a while-loop as long as the remainder of num/divisor is not equal to 0
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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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while (num % divisor != 0) {
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run a while-loop as long as the remainder of num/divisor is not equal to 0
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Since we don't know ahead of time how many times the loop will be repeated, we need to use a while loop.
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while (num % divisor != 0) {
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run a while-loop as long as the remainder of num/divisor is not equal to 0
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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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run a while-loop as long as the remainder of num/divisor is not equal to 0
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Therefore, we need to use a loop structure.
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while (num % divisor != 0) {
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run a while-loop as long as the remainder of num/divisor is not equal to 0
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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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run a while-loop as long as the remainder of num/divisor is not equal to 0
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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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private int y;
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This line creates a private integer y variable to later be defined.
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Therefore, we need to declare an instance variable for the class to store the y-coordinate of the point.
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private int y;
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This line creates a private integer y variable to later be defined.
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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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This line creates a private integer y variable to later be defined.
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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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This line creates a private integer y variable to later be defined.
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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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This defines the function translate and its parameters x and y.
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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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This defines the function translate and its parameters x and y.
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We define this method as public to provide access to this method from outside of the class.
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public void translate(int dx, int dy) {
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This defines the function translate and its parameters x and y.
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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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This defines the function translate and its parameters x and y.
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Note that both of the parameters are declared as integers because the point has integer coordinates.
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divisor += 1;
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keep the adding 1 to newly defined "divisor" for each iteration
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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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x += dx;
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this line adds the arguments the user gives to the function, to x.
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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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This defines the function setX and describes what parameters it should take (an int).
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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 setX(int newX) {
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This defines the function setX and describes what parameters it should take (an int).
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We define this method as public to provide access to this method from outside of the class.
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public void setX(int newX) {
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This defines the function setX and describes what parameters it should take (an int).
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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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This defines the function setX and describes what parameters it should take (an int).
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Note that the instance variable x is private; thus, it cannot be directly changed from outside the class.
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public void setX(int newX) {
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This defines the function setX and describes what parameters it should take (an int).
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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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This defines the function setX and describes what parameters it should take (an int).
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It can be changed from outside the class only through this method.
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public void setX(int newX) {
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This defines the function setX and describes what parameters it should take (an int).
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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 setX(int newX) {
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This defines the function setX and describes what parameters it should take (an int).
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We define this method as public to provide access to this method from outside of the class.
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public void setX(int newX) {
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This defines the function setX and describes what parameters it should take (an int).
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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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This defines the function setX and describes what parameters it should take (an int).
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Note that the instance variable x is private; thus, it cannot be directly changed from outside the class.
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public void setX(int newX) {
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This defines the function setX and describes what parameters it should take (an int).
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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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This defines the function setX and describes what parameters it should take (an int).
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It can be changed from outside the class only through this method.
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public void setX(int newX) {
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This defines the function setX and describes what parameters it should take (an int).
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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 setX(int newX) {
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This defines the function setX and describes what parameters it should take (an int).
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We define this method as public to provide access to this method from outside of the class.
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public void setX(int newX) {
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This defines the function setX and describes what parameters it should take (an int).
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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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This defines the function setX and describes what parameters it should take (an int).
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Note that the instance variable x is private; thus, it cannot be directly changed from outside the class.
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public void setX(int newX) {
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This defines the function setX and describes what parameters it should take (an int).
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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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This defines the function setX and describes what parameters it should take (an int).
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It can be changed from outside the class only through this method.
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public int getX() {
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defines fucntion getX
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We define this method as public to provide access to this method from outside of the class.
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public int getX() {
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defines fucntion getX
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This method returns the x-coordinate of the point.
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public int getX() {
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defines fucntion getX
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Note that the instance variable x is private; thus, it cannot be directly accessed from outside the class.
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public int getX() {
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defines fucntion getX
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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.
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public int getX() {
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defines fucntion getX
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It can be accessed from outside the class only through this getter method.
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public int getX() {
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defines fucntion getX
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We define this method as public to provide access to this method from outside of the class.
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public int getX() {
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defines fucntion getX
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This method returns the x-coordinate of the point.
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public int getX() {
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defines fucntion getX
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Note that the instance variable x is private; thus, it cannot be directly accessed from outside the class.
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public int getX() {
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defines fucntion getX
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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.
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public int getX() {
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defines fucntion getX
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It can be accessed from outside the class only through this getter method.
| 1 |
System.out.println("The smallest divisor of " + num + " is " + divisor);
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output the result of "divisor"'s last value to the user
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This statement prints to the default standard output stream the smallest divisor of the number.
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String fullName = "John Smith"
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This stores the String "John Smith" into a string variable named fullName.
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We define a string variable to hold the name.
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String fullName = "John Smith"
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fullName can later be used to get the data (initials) from it.
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We define a string variable to hold the name.
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String firstInitial = fullName.substring(0, 1);
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This uses the fullName variable to get the first character from it and store it in a variable string called firstInitial.
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We need to extract the first letter from the first name.
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String firstInitial = fullName.substring(0, 1);
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This uses the fullName variable to get the first character from it and store it in a variable string called firstInitial.
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We do this by calling the substring(0,1) method.
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String lastInitial = fullName.substring(5, 6);
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This uses the fullName variable to get the 6th character from it and store it in a variable string called lastInitial.
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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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This uses the fullName variable to get the 6th character from it and store it in a variable string called lastInitial.
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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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This creates a new string called initials by combining the firstInitial and lastInitial string.
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This statements concatenates the extracted initials and store the result in the string initials.
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System.out.println(initials);
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This prints out the initials.
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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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This prints out the initials.
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The printed value is followed by the end-of-line character at the end.
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System.out.println(initials);
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This prints out the initials.
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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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This prints out the initials.
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The printed value is followed by the end-of-line character at the end.
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Scanner scan = new Scanner(System.in);
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This creates a new scanner object called scan.
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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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This creates a new scanner object called scan.
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We need to read and process the integer that the user enters.
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Scanner scan = new Scanner(System.in);
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scan can later be used to help retrieve user input.
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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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scan can later be used to help retrieve user input.
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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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This prints out "Enter an integer: " which tells the user what to do.
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We prompt the user to enter an integer.
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int num = scan.nextInt();
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This saves what ever the user entered into an int variable called num/.
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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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This saves what ever the user entered into an int variable called num/.
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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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This closes / end the scanner since it will no longer be used.
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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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This checks whether the value given by the user was 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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This checks whether the value given by the user was 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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This checks whether the value given by the user was 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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This checks whether the value given by the user was 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.
| 1 |
if ( num > 0 ) {
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This checks whether the value given by the user was greater than 0.
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If both of these tests fail, then we could conclude that the integer is zero.
| 2 |
if ( num > 0 ) {
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This checks whether the value given by the user was greater than 0.
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If the integer is neither positive nor negative, then we could conclude that the integer is zero.
| 2 |
if ( num > 0 ) {
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This checks whether the value given by the user was 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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This checks whether the value given by the user was 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.
| 1 |
if ( num > 0 ) {
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This checks whether the value given by the user was 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.
| 1 |
if ( num > 0 ) {
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This checks whether the value given by the user was 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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if ( num > 0 ) {
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It can be used to check if the value is positive.
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If the integer is neither positive nor negative, then we could conclude that the integer is zero.
| 2 |
if ( num > 0 ) {
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It can be used to check if the value is positive.
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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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It can be used to check if the value is positive.
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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.
| 3 |
if ( num > 0 ) {
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It can be used to check if the value is positive.
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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.
| 1 |
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