// Demonstrates parameter passing in C
// Compile: gcc -o swaptest swaptest.c
// Execute: swaptest
//
#include <stdio.h>
int main(int argc, char *argv[])
{
    // Designate the params as by reference
    void swap(int *x, int *y)
    {
        int t = *x;   // Explicit dereference
        *x = *y;
        *y = t;
    }

    printf("swaptest.c, by reference\n");    

    int a = 1;
    int b = 2;

    printf("%d, %d\n", a, b);    

    // Pass the addresses of a and b
    swap(&a, &b);

    printf("%d, %d\n", a, b);    
}