Returns Review

These questionss are designed to asssess your current understanding of returns!

Refer to this block of code to answer the following questions:

public static void main(String[] args) {
    int val = 2; 
    val = mOne(val);          // Line 3
    val = -1;                 
    val = mOne(val);          // Line 5
    String state = mTwo(val); // Line 6
    val++;                    
    state = mTwo(val);        // Line 8
}

public static int mOne(int currNum) {
    currNum = currNum * -1;
    return currNum;
}

public static String mTwo(int num) {
    return "our number is " + num;
}

Questions 1

What is val after line 3 has been executed?

See Answer

-2

We pass in val—which is initialized to 2—into mOne(). Then we multiply the input inside mOne() by -1.

Thus, 2 * -1 is -2.

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Question 2

What is val after line 5 has been executed?

See Answer

1

We pass in val—which is now updated to -1—into mOne(). Then we multiply the input inside mOne() by -1.

Thus -1 * -1 is 1.

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Question 3

What is state after line 6 has been executed?

See Answer

False! “our number is 1”

After line 5 has been executed, val is 1. Then val is passed into mTwo().

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Question 4

What is state after line 8 has been executed?

See Answer

“our number is 2”

After line 7 has been executed, val is 2. Then val is passed into mTwo().