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BJP3 Self-Check 7.25: arrayMystery2

Language/Type: Java array mystery arrays
Author: Marty Stepp (on 2013/09/02)

Consider the following method, mystery. 

public static void mystery2(int[] a, int[] b) {
    for (int i = 0; i < a.length; i++) {
        a[i] = a[2 * i % a.length] - b[3 * i % b.length];
    }
}

What are the values of the elements in array a1 after the following code executes? 

int[] a1 = {2, 4, 6, 8, 10, 12, 14, 16};
int[] a2 = {1, 1, 2, 3, 5, 8, 13, 21};
mystery2(a1, a2);
a1[0]
a1[1]
a1[2]
a1[3]
a1[4]
a1[5]
a1[6]
a1[7]

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