closure-test.c

#include <stdio.h>
 
void *create_counter(int n)
{
	static int m = 0;
    int counter()
    {
        printf("address in closure %p\n", &m);
        return m++;
    }
 
    printf("original address %p\n", &n);
 
	m = n;
    return counter;
}
 
int main()
{
    int (* func1)(void) = create_counter(5);
    int (* func2)(void) = create_counter(10);
 
    /* toooooooooooooooooo bad! */
    printf("%d\n", func1());
    printf("%d\n", func2());
    printf("%d\n", func1());
    printf("%d\n", func2());
    printf("%d\n", func1());
    printf("%d\n", func2());
 
    return 0;
}