#include <stdio.h>

int im_outside = 42;

void afunction()
{
    printf("Here is an outside variable as seen from a function %i\n", im_outside);
    return;
}

int main (int argc, const char * argv[])
{
    printf("Here is a variable I can see: %i\n", im_outside);
    afunction();
    return 0;
}