gcd

#include<stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <stdbool.h>

int gdc(int n, int m);


int calcGdcFromAllArguments(int argc, char *const *argv, int result);

int main(int argc, char *argv[]) {

    int result = 0;

    if (argc > 1) {
        int n = atoi(argv[0]);
        int m = atoi(argv[1]);
        result = gdc(n, m);
    } else {
        printf("Please enter at least two integers as arguments\n");
    }

    result = calcGdcFromAllArguments(argc, argv, result);

    printf("%d", result);

    return 0;
}

int calcGdcFromAllArguments(int argc, char *const *argv, int result) {
    for (int i = 2; i < argc; i++) {
        if (isdigit(*argv[i]) != 0) {
            int m = atoi(argv[i]);
            result = gdc(result, m);
        } else {
            printf("%s is not an integer and will be ignored in computation\n", argv[i]);
        }
    }
    return result;
}

int gdc(int n, int m) {

    if (m > n) {
        return gdc(m, n);
    }

    if (m == 0) {
        return n;
    } else {
        return gdc(m, n % m);
    }
}