vigenere

#include <cs50.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <stdlib.h>



int main(int argc, string argv[1]);
    int j;

{
    if (argc != 2) //if user doesn't run command-line argument of one or enter positive int
    {
        printf("Usage: ./vigenere key\n"); //prompt them to run it again
        return 1; //returning zero means everything went well
    }

    if (isalpha(argv[1])) //If user inputs an alpha key continue


    }