DPSpSW - Online C Compiler & Debugging Tool

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


int main(int argc, char * argv[])
{
    int ** arr = NULL;
    char * endptr = NULL;
    long int arr_size = 0;
    long int ints_inside_arr = 0;
    if (3 != argc)
    {
        printf("Please Specify the size of the multi dimensional array you want to create and try again!\n");
        printf("Example : ./main 3 4\n This would result in a 3x4 multi dimensional array");
        exit(0);
    }

    arr_size = strtol(argv[1], &endptr, 10);

    if (endptr == argv[1])
    {
        printf("No Digits Were Found!\n");
        exit(0);
    }
    else if (*endptr != '\0')
    {
        printf("Invalid Character. Please enter digits only in the format of [num] [num2]\n");
        exit(0);
    }

    endptr = NULL;

    ints_inside_arr = strtol(argv[2], &endptr, 10);

    if (endptr == argv[2])
    {
        printf("No Digits Were Found!\n");
        exit(0);
    }
    else if (*endptr != '\0')
    {
        printf("Invalid Character. Please enter digits only in the format of [num] [num2]\n");
        exit(0);
    }

    arr = calloc(arr_size, sizeof(int *));

    if (NULL == arr)
    {
        perror("Error Allocating Memory For Array!\n");
        exit(EXIT_FAILURE);
    }

    for (int i = 0; i < arr_size; i++)
    {
        arr[i] = calloc(ints_inside_arr, sizeof(int));

        if (NULL == arr[i])
        {
            perror("Failure to allocate memory for inner array!\n");
            for (int j = 0; j < i; j++)
            {
                free(arr[j]);
            }
            free(arr);
            exit(EXIT_FAILURE);
        }
    }
    printf("ARRAY OF INTS CREATED : \n");
    for (int i = 0; i < arr_size; i++)
    {
        for (int j = 0; j < ints_inside_arr; j++)
        {
            arr[i][j] = j;
            printf("%d ", arr[i][j]);
        }
        printf("\n");
    }

    for (int i = 0; i < arr_size; i++)
    {
        free(arr[i]);
    }

    free(arr);

    printf("All Memory Successfully Freed!\n");

    return 0;
}