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< MysteryGhost

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Main Page → Exercises → Java → Solve an Exercise

Language/Type: Java parameters return

Author: Mehran Sahami (on 2017/10/03)

For the following console program, trace through its execution by hand to write the four lines of output that are produced when it runs:

/*
 * File: OneTwoThree.java
 * -------------------
 * This program is designed to test your understanding of parameters,
 * return values, and instance variables
 */
public class OneTwoThree {
    public static void main(String[] args) {
        int a = 100;
        addOne();
        addTwo(a);
        a = addThreeAndReturnResult(a);
        println("run: a = " + a + ", b = " + b);
    }

    private static void addOne() {
        int a = 101;
        b++;
        println("addOne: a = " + a + ", b = " + b);
    }

    private static void addTwo(int a) {
        a += 2;
        b += 2;
        println("addTwo: a = " + a + ", b = " + b);
    }

    private static int addThreeAndReturnResult(int a) {
        a += 3;
        b += 3;
        println("addThreeAndReturnResult: a = " + a + ", b = " + b);
        return a;
    }

    /* Private instance variable */
    private int b = 200;
}

line 1
line 2
line 3
line 4

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