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

//i is what number character of the string, s asks you for a string, n asks you what the key is, and b is what will be printed
// lines 8 to 14 makes sure the user puts in 2 command line arguments
// int a is what number character of the cipherc code

int main(int argc, string argv[])
{
    //making sure I have two command line arguments
    if (argc != 2)

    {
        printf("Usage:%s abc\n" , argv[0]);
        return 1;
    }
    //code only runs with two command line arguments
    if (argc == 2)
    {
        string s = get_string("plaintext: ");
        string b = (argv[1]);//argv1 is the string given at the command line argument





    // setting the cipher to the correct amount
        for (int a = 0; a <= (strlen(b)); a++)
        for (int i = 0; i < strlen(s); i++)
            {
            {
                 if (a == strlen(b))
            {
                a = 0;
            }
                if (islower(b[a]))
                {
                    b[a] = toupper(b[a]);
                }
                if (isupper(b[a]))
                {
                    b[a] = b[a] - 65;

                }
                {




                     {
        // making sure the code wraps around capital z instead of going over it
                        while (s[i] + b[a] > (int)'Z' && isupper(s[i]))

                        {

                            s[i] = s[i] - 26;
                        }

                            if (ispunct(s[i]) || isspace(s[i]))
                                {
                                    s[i] = s[i] - b[a];
                                }
                     }


         // making sure the code wraps around lowercase z instead of going over it
                    {
                         while (s[i] + b[a] > (int)'z' && islower(s[i]))

                        {

                            s[i] = s[i] - 26;
                        }
                    }
                    if (i ==strlen(s) - 1)
                    {
                        break;
                    }
            }







                {

                 {


                 printf("%c", s[i] + b[a]);

                    }


            }


        }
    }
}


}