Simple Caesar cyptography

Hey guys I am working on implementing a simple cryptography program called Caesar. I got this program to work perfectly when I was writing a function to handle the cryptography and just declaring the string that I wanted to encrypt and the integer I wanted to move the letters by to encrypt it. maybe you can help me out and tell me what I am doing wrong here. I am just trying to get the user to enter the key into main and then be prompted for the string to encrypt.

I ended up with a segmentation fault.. I have absolutely no idea what I am looking at but when I ran GDP I get this

#0 0x001bd283 in ____strtol_l_internal (nptr=0x0, endptr=0x0, base=10, group=0,
loc=0x3123a0) at strtol_l.c:298..


Anyways here is my code..

Code:

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


int main (int argc, char *argv[])
{

    // turn string k into int k
    int k = atoi(argv[1]);
    k = k % 26;
    
    int i = 0;
    
    // prompt user for string
    string word = GetString();
    
    // below here all works fine when I had it as a stand alone function that I 
    // passed arguments to from main.. should encrypt by "k" letters
    while (word[i] != '\0')
    {
       if (word[i] >= 'a' && word[i] <= 'z')
       {
           word[i] = (word[i] + k - 97) % 26 + 97; 
           i++;
       }
       
      else  if (word[i] >= 'A' && word[i] <= 'Z')
        {
            word[i] = (word[i] + k - 65) % 26 + 65;
            i++;
        }
        else
            i++;
    }
    word[i] = '\0';
    
    printf("%s\n", word); 
        
}

It's possible that GetString() is not putting a '\0' at the end of you string.

ok so I replaced the getString portion of the code with simply declaring a string called "word". That way I could determine if that was the issue. Apparently it is not because I am still getting a segmentation fault. So it has nothing to do with GetString. Instead it has do with "k". Can someone please tell em what is wrong with how I have written the main function and k?

I figured it out never mind. Anyone know how to delete a post?

You do not want to delete this thread, because it might help someone

Post your solution for everyone who is having the same problem

You don't. It is not your place to decide that nobody else should benefit from finding the same problem and solution at a later date.
The more courteous posters actualy post what the cause and solution was.

sorry I just read this.. the solution was that I was not inputting the initial values into the main function right. I thought that I type ./caesar and press enter and then it will prompt me for the input to main. I did not realize I had to type it like ./caesar input.