Program to explain call by value

/* program to explain call by value */
#include<stdio.h>
main ( )
{
    int a = 5;
    int b = 8;
    printf ( " Before calling the function a and b are %d , %d\n",a,b);
    value( a , b );
    printf ( " After calling the a and b are %d , %d\n",a,b);
}
value ( p , q )
int p , q;
{
    p++;
    q++;
    printf ( " In function changes are %d , %d\n", p , q);
}