Arizona State University (ASU) CSE100 Principles Of Programming With C++ Midterm 1 Practice Exam

What does the following code do: `int x = 5; x += 3;`?

It sets x to 3 It adds 5 and 3, setting x to 8 It adds 3 to x, so x becomes 8 It subtracts 3 from x, so x becomes 2

Correct Answer:

It adds 3 to x, so x becomes 8

Explanation:

The code `int x = 5; x += 3;` performs an operation where the initial value of `x` is set to 5. The statement `x += 3;` is shorthand for adding 3 to the current value of `x` and then assigning the result back to `x`. Initially, `x` is 5. When you execute `x += 3;`, it computes 5 + 3, resulting in 8, and then updates `x` to hold this new value. Thus, after the execution of the code, the value of `x` becomes 8, which is why the correct answer is that it adds 3 to `x`, so `x` becomes 8. The other options imply incorrect operations: setting `x` to 3 or subtracting values, neither of which accurately represents the operation being performed in the code snippet.

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