void swap (int *num1, int *num2); van someone explain about this"swap"?

Answer 1

Swap is a function which change value if assigned properly,
Like
void swap(int * n1 , int * n2)
{ int * temp;
* temp= *n1;
*n1=*n2;
*n2=*temp;
// values of n2 and n1 are
//permanently changed .
}