simple loops in c

loops.c

#include <stdio.h>

int main(int argc, char **argv)
{
    int i, max;

    // check at least one argument provided
    if (argc < 2) {
        printf("missing required argument max");
        return -1;
    }

    // read max argument from args
    sscanf(argv[1], "%d", &max);

    // ensure that the max value is valid
    if (max < 1) {
        printf("expected type int for argument max");
        return -2;
    }

    // print numbers in range [0, max)
    for (i = 0; i < max; i++)
        printf("%d\n", i);

    return 0;
}