Question

The minimum number of temporary variables needed to swap the contents of two variables is:

(a) 1     (b) 2

(c) 3     (d) 0

Answer 1

var a ,b;

a=a+b;

b=a-b;

a=a-b;

or

a=a*b;

b=a/b;

a=a/b;
 no temporary variables is needed

Comments

I am also getting 0 (zero).

---

...k  then u r right

Answer 2

#include <stdio.h>
int main(void) {
    int a=5;
    int b=4;
    a=a^b;
    b=a^b;
    a=a^b;
    printf("%d %d",a,b);
    return 0;
}

Answer 3

Answer d