Assume that x, y, and temp are Integer variables. Which of the following lines of code swaps the values of x and y?
A) x = y
y = x
B) x = temp
x = y
y = temp
C) temp = x
x = y
y = temp
D) x = y temp = x y =
temp

Question

Assume that x, y, and temp are Integer variables. Which of the following lines of code swaps the values of x and y?
A) x = y 
y = x
B) x = temp 
x = y 
y = temp
C) temp = x
 x = y
 y = temp
D) x = y temp = x y = 
temp

Quizplus · Accepted Answer

To swap the values of x and y, we need a temporary variable (in this case, temp) to store the value of x temporarily, assign the value of y to x, and then assign the value of temp to y. Choice A assigns the value of y to x first, so the original value of x is lost. Choice B assigns the value of y to temp first, so the original value of x is never stored. Choice D assigns the value of y to temp first, but then assigns the original value of x to y before assigning the value of temp to y, so the original value of y is lost. Only choice C correctly swaps the values of x and y using a temporary variable.

Assume That X, Y, and Temp Are Integer Variables