UGC-NET | UGC NET CS 2018 July - II | Question 5

Given below are three implementations of the swap( ) function in C++: (a)

void swap (int a, int b)
{
int temp;
temp = a;
a = b;
b = temp;
}
int main( )
{
int p = 0, q = 1;
swap (p, q);
}

(b)

void swap (int &a, int &b)
{
int temp;
temp = a;
a = b;
b = temp;
}
int main( )
{
int p = 0, q = 1;
swap (p, q);
}

(c)

void swap (int * a, int * b)
{
int * temp;
temp = a;
a = b;
b = temp;
}
int main( )
{
int p = 0, q = 1;
swap (&p, &q);
}

Which of these would actually swap the contents of the two integer variables p and q?

(A)

(a) only

(B)

(b) only

(C)

(D)

(b) and (c) only

Answer

Please comment below if you find anything wrong in the above post
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