Consider the following C function void swap ( int x, int y ) { int tmp; tmp =…
2017
Consider the following C function
void swap ( int x, int y )
{
int tmp;
tmp = x;
x= y;
y = tmp;
}In order to exchange the values of two variables a and b:
- A.
Call swap (a, b)
- B.
Call swap (&a, &b)
- C.
swap(a, b) cannot be used as it does not return any value
- D.
swap(a, b) cannot be used as the parameters passed by value
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Correct answer: D
In C, function arguments are passed by value. The swap function receives copies of the variables a and b. Modifying x and y inside the function does not affect the original variables outside. To exchange values, pointers must be used as parameters.