Guess a 4-digit PIN

guess.c

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>

#define MAX_PIN 9999

int main(int argc, char** argv) {
    if (argc != 2) {
        printf("usage: guess pin\n");
        return EXIT_FAILURE;
    }

    uint16_t pin = atoi(argv[1]);

    for (uint16_t i=0;i<MAX_PIN;i++) {
        if (i == pin) {
            printf("done\n");
            break;
        }
    }

    return EXIT_SUCCESS;
}