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Which of the following code segments can be used to interchange the values of the variables num1 and num2?
A
num1 ↔ num2
num2 ↔ num1
B
temp ↔ num1
num1 ↔ temp
num2 ↔ num1
C
temp ↔ num1
num2 ↔ num1
num1 ↔ temp
D
temp ↔ num1
num1 ↔ num2
num2 ↔ temp
The correct answer is D:
temp ← num1
num1 ← num2
num2 ← temp
Explanation: This code segment uses a temporary variable (`temp`) to temporarily hold the value of `num1`. It then assigns the value of `num2` to `num1`, and finally assigns the value stored in `temp` (original value of `num1`) to `num2`. This effectively interchanges their values without losing any information. If you have more questions or need clarification, feel free to ask!