Loading simulation in c

loading.c

#include <stdio.h>
#include <unistd.h>

int main()
{
        char bar[] = {
                        '-',
                        '\\',
                        '|',
                        '/'
                       };
        unsigned int i;
        int speed = 40000; //miliseconds

        for (i = 0; ; ++i) {
                printf("Loading ... %c \r", bar[i % sizeof(bar)]);
                fflush(stdout); // clean
                usleep(speed); // resets execution
        }

        return 0;
}