while-loop.md

While Loop

Midterm Study Session

1. While Loop Simulations. Consider the following method:

public static void mystery(int x) {
    int y = 1;
    int z = 2;
    while (x > z) {
        if (x % z == 0) {
            x = x / z;
            y++;
        } else {
            z++;
        }
    }
    System.out.println(y + " " + z);
}

For each call below, indicate what output is produced:

Method Call	Output Produced
mystery(2);
mystery(5);
mystery(9);
mystery(12);

2. While Loop Simulations. Consider the following method:

public static void mystery(int n) {
    int x = 1;
    int y = 2;
    while (y < n) {
        if (n % y == 0) {
            n = n / y;
            x++;
        } else {
            y++;
        }
    }
    System.out.println(x + " " + n);
}

For each call below, indicate what output is produced:

Method Call	Output Produced
mystery(4);
mystery(5);
mystery(24);
mystery(28);

3. While Loop Simulations. Consider the following method:

public static void mystery(int i, int j) {
    while (i != 0 && j != 0) {
        i = i / j;
        j = (j - 1) / 2;
        System.out.print(i + " " + j + " ");
    }
    System.out.println(i);
}

For each call below, indicate what output is produced:

Method Call	Output Produced
mystery(5, 0);
mystery(3, 2);
mystery(16, 5);
mystery(80, 9);
mystery(1600, 40);