Question

I’m playing with static keyword. In the code below I can’t figure out why x save it’s before state and increment.
I was expecting to print 1 tree times. As I know a such behaivor should happen if I declare x as static.

void print_it(void);

    int main (int argc,  const char * argv[])
    {
        print_it();
        print_it();
        print_it();
        exit(EXIT_SUCCESS);
    }

    void print_it(void)
    {
        int x;
        printf("%d\n", x++);
    }

Answer 1

You have not initialized x to any value. Therefore, the initial value in x would be garbage and as it happens, this garbage increments itself every time because it is probably using the same memory location everytime.

Try changing your code to this:

void print_it(void);
int main (int argc,  const char * argv[])
{
    print_it();
    print_it();
    print_it();
    exit(EXIT_SUCCESS);
}

void print_it(void)
{
    int x = 0;
    printf("%d\n", x++);
}