vigenere

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


int main(int argc, string argv[])

{
    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
    }

    for (int j = 0, n = strlen(argv[1]);  j < n; j++)  //length of the entire string. Save n as strlen for use in loop
    {
        if (isalpha(argv[1][j])) //if user doesn't run command-line argument of one or enter positive int and user inputs an alpha key, continue

        {
            //printf("%c\n", argv[1][j]); //Print after collecting plaintext
        }


        else

        {
            printf("Usage: ./vigenere key\n"); //prompt them to run it again
            return 1; //returning zero means everything went well
        }

    }

    string p = get_string("plaintext: "); //prompt for plaintext and store


}