Question

What will the following program display? public class checkpoint { public static void main(String urgs[]) { int n = 1776; doubled = 110.0901; System .out.println(n + “\t” + d); myMethod(n, d); System.out.println(n + “\t” + d); } public static void myMethod(int i, double x) { System.out.printing + “\t” + x); i = 1250; x= 199.99; System.out.println(i + “\t" + x); } } Write the following two methods: i. compute Diameter; This method accepts the radius (r) of a circle, and returns diameter (2*r; radius = 2.5). Declare all variables used here & initialize radius: __________ Show method call: ________ Write method code here:

Answer 1

Q-12
Answer :

1776   110.0901
1776   110.0901
1250 199.99
1776   110.0901

in Java Primitive variable are copied by value. so when you pass the variable n and d to mymethod new copy of n and d is created and assigned to x and i .

So, 4th line output is 1776 110.0901

Q - 13

public class TestDiameter {

    public static void main(String args[]){
      /* Variable declaration */
      double r = 2.5;
      /* Method call */
      double d = computeDiameter(r);
      System.out.println("diameter "+ "\t"+d);



    }
     /* Method declaration */
    public static double computeDiameter(double r){
        return r*2;
    }
}