/*
    In this example we demonstrate how to pass two pointers to long
    as parameters to a function
*/

#include <stdio.h>

/*
    Function prototype
*/
void swap_nums(long *, long *);

void main()
{
// We declare two long variables l1 and l2
    long l1 = 1;
    long l2 = 2;
    printf("Before swaping : l1 = %ld, l2 = %ld.\n",l1,l2);
// Note: The & symbol before a variable represends a pointer to the variable
    swap_nums(&l1, &l2);
    printf("After swaping : l1 = %ld, l2 = %ld.\n",l1,l2);
}

/*
    Function swap_nums source code
*/
void swap_nums(long *p1, long *p2)
{
    long t = *p1;
    *p1 = *p2;
    *p2 = t;
}

© 2004 Jim Valavanis