Assume you have two integer variables, num1 and num2. Which of the following is the correct way to swap the values in these two variables?
A) int temp = num1;
Num2 = num1;
Num1 = num2;
B) int temp = num2;
Num2 = num1;
Num1 = temp;
C) num1 = num2;
Num2 = num1;
D) int temp = num1;
Num2 = temp;
Temp = num2;
Num1 = temp;
E) None of these

Question

Quizplus · Accepted Answer

To swap the values in two variables, we need to use a temporary variable as a placeholder. In choice B, we correctly assign num2 to the temporary variable temp, then assign num1 to num2, and finally assign temp (which now holds the original value of num2) to num1. This successfully swaps the values in the two variables.

The other choices have mistakes in their implementation. Choice A assigns num1 to temp before swapping the values, so it doesn't actually swap them. Choice C assigns num2 to num1 before assigning num1 to num2, so both variables end up holding the value of num2. Choice D assigns num1 to temp, then assigns num2 to num1, but then mistakenly re-assigns temp to num2 instead of the other way around.

Assume You Have Two Integer Variables, Num1 and Num2