c - "Incompatible integer to pointer conversion" -

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the following program refusing compile because of these errors: 

vigenere.c:52:31: error: incompatible integer pointer conversion assigning   'string' (aka 'char *') 'int' [-werror,-wint-conversion]   ...ciphertext[i] = ((((plaintext[i] - 65) + keyword[num % keylength]) % 26) + 65);                    ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ vigenere.c:56:31: error: incompatible integer pointer conversion assigning   'string' (aka 'char *') 'int' [-werror,-wint-conversion]   ...ciphertext[i] = ((((plaintext[i] - 97) + keyword[num % keylength]) % 26) + 97);                    ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

and here's program, meant implement simple vigenere cipher:

#include <stdio.h> #include <cs50.h> #include <string.h> #include <ctype.h>  int main(int argc, string argv[]) {     if(argc != 2)     {         printf("invalid input; try again!\n");         return 1;     }     else if(argv[1])     {            for(int = 0, n = strlen(argv[1]); < n; i++)         {             if(!isalpha(argv[1][i]))             {                 printf("invalid input; try again!\n");                 return 1;             }         }     }      // plaintext user     string plaintext = getstring();     string ciphertext[100];     int num = 0;      string keyword = argv[1];     int keylength = strlen(keyword);      // change key values letters shifts     for(int = 0, n = keylength; < n; i++)     {         if(isupper(keyword[i]))         {             keyword[i] = keyword[i] - 65;         }         else if(islower(keyword[i]))         {             keyword[i] = keyword[i] - 97;         }     }      for(int = 0, n = strlen(plaintext); < n; i++)     {         if(isalpha(plaintext[i]))         {             if(isupper(plaintext[i]))             {                    ciphertext[i] = ((((plaintext[i] - 65) + keyword[num % keylength]) % 26) + 65);             }             else if(islower(plaintext[i]))             {                 ciphertext[i] = ((((plaintext[i] - 97) + keyword[num % keylength]) % 26) + 97);             }             num++;         }         // non-alphabetic characters         else          {             ciphertext[i] = plaintext[i];         }         printf("%c", ciphertext[i]);     }     printf("\n"); }

i've no idea why compiler throws error, because have older version of program, compiled few months ago (the code same on lines 52 , 56) works fine.

i'll appreciate , :)

variable ciphertext array of char*, think should be:

char ciphertext[1000]

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