#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
        int a = 0;




        // setting the cipher to the correct amount

            for (int i = 0; i <= strlen(s); i++)


            {
                if (i >= strlen(b))
                {
                    a = i - strlen(b);
                }
                else
                {
                    a = i;
                }

                {


                    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;
                                    }















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









                }
        }

    }
}