/*
 * A static variable inside a function keeps 
 * its value between invocations.
 */
#include <stdio.h>

void test (void);


void test (void)
{
    int a = 10;
    static int sa = 10;

    a += 5;
    sa += 5;

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


int main(void)
{
    int i;

    for (i = 0; i < 10; i++)
    {
        test ();
    }

    return 0;
}