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  1. #include <stdio.h>
  2. #include <cs50.h>
  3. #include <stdlib.h>
  4. #include <ctype.h>
  5. #include <string.h>
  6.  
  7. int main(int argc, string argv[])
  8. {
  9.     int alph_indx(char ch);
  10.     if (argc != 2)
  11.     {
  12.         printf("usage ./vigenere keyword, where k is non negative integer");
  13.         return 1;
  14.     }
  15.     string k = argv[1];
  16.     printf("plaintext: ");
  17.     string plaintext = get_string();
  18.     string ciphertext = plaintext;
  19.     //encipher
  20.     for (int i = 0, n = 0; i < sizeof(plaintext); i++)
  21.     {
  22.         if (isalpha(plaintext[i]))
  23.         {
  24.             if (isupper(plaintext[i]))
  25.             {
  26.                 //toupper
  27.                 ciphertext[i] = ( alph_indx(plaintext[i]) + alph_indx(k[n % strlen(k)]) ) + 'A';
  28.             }
  29.             else if (islower(plaintext[i]))
  30.             {
  31.                 //tolower
  32.                 ciphertext[i] = ( alph_indx(plaintext[i]) + alph_indx(k[n % strlen(k)]) ) + 'a';
  33.  
  34.             }
  35.             else if (isblank(plaintext[i]))
  36.             {
  37.                 ciphertext[i] = plaintext[i];
  38.             }
  39.         }
  40.     }
  41.  
  42.     printf("ciphertext: %s", ciphertext);
  43.  
  44.     return 0;
  45.  
  46. }
  47. int alph_indx(char ch)
  48. {
  49.     int num = ch;
  50.  
  51.     return (isupper(ch)) ? ((num - 'A') % 26) : ((num - 'a') % 26);
  52. }
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin
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Standard input is empty
compilation info 
prog.cpp:2:10: fatal error: 'cs50.h' file not found
#include <cs50.h>
         ^
1 error generated.
stdout
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Standard output is empty
https://ideone.com/IlQ4GL
language:
C++14 (clang 8.0)
created:
8 years ago
visibility:
public

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