p029static

#include <stdio.h>

// just proving that static variables actually work

int myfunction() { 

    static int result = 0; // 0 means we haven't done the calculation yet 

    if (result == 0) {

        result = 100; // pretend this is an expensive calculation

        printf("\n\nCalculating result for the first and only time\n");

    }

    return result;

}

int main (int argc, const char * argv[])

{

    printf("result is %i\n", myfunction());

    printf("result is %i\n", myfunction());

    printf("result is %i\n", myfunction());

    printf("\n");

    

    return 0;

}

Calculating result for the first and only time

result is 100

result is 100

result is 100