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  1. #include <stdio.h>
  2. #include <cs50.h>
  3. #include <string.h>
  4. int main (int argc , string argv[])
  5. {
  6.     string k = argv[1];
  7.     if (argc != 2)
  8.     {
  9.         printf("Error, Enter one word made of alphabetical characters");
  10.         return 1;
  11.     }
  12.     else 
  13.     {
  14.         for (int i = 0, n = strlen(k); i < n; i++)
  15.         {
  16.             if (!((k[i] >= 'a' && k[i] <= 'z') || (k[i] >= 'A' && k[i] <= 'Z')))
  17.             {
  18.                 printf("Error, Enter one word made of alphabetical characters");
  19.                 return 1;
  20.             }
  21.         }
  22.         printf("plaintext:");
  23.         string p = get_string();
  24.         printf("ciphertext:");
  25.         for (int j = 0 , i = 0, n = strlen(p); j < n; j++)
  26.         {
  27.  
  28.             if (i>= strlen(k))
  29.             {
  30.                 i = 0;
  31.             } 
  32.             int s = p[j] + k[i] - 'a';
  33.             int c = p[j] + k[i] - 'A';
  34.             if (k[i] >= 'A' && k[i] <= 'Z')
  35.             {
  36.                k[i] = k[i] + 32;
  37.             }
  38.             if ((p[j] >= 'a' && p[j] <= 'z' && s > 'z' ) || (p[j] >= 'A' && p[j] <= 'Z' && c > 'Z'))
  39.             {
  40.                 printf("%c" , p[j] + k[i] - 'a' - 26);
  41.             }
  42.             else if ((p[j] >= 'a' && p[j] <= 'z') || (p[j] >= 'A' && p[j] <= 'Z'))
  43.             {
  44.                 printf("%c" , p[j] + k[i] - 'a');
  45.             }    
  46.             else
  47.             {
  48.                 printf("%c" , p[j]);
  49.             }
  50.             i++;
  51.         }     
  52.         printf("\n");
  53.         return 0;
  54.     }
  55. }
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin
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Standard input is empty
compilation info 
prog.c: In function ‘main’:
prog.c:23:20: warning: implicit declaration of function ‘get_string’ [-Wimplicit-function-declaration]
         string p = get_string();
                    ^~~~~~~~~~
prog.c:23:20: warning: initialization makes pointer from integer without a cast [-Wint-conversion]
/home/hYpA06/ccuJFJzz.o: In function `main':
prog.c:(.text.startup+0x84): undefined reference to `get_string'
collect2: error: ld returned 1 exit status
stdout
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Standard output is empty
https://ideone.com/mLZV2A
language:
C (gcc 8.3)
created:
6 years ago
visibility:
public

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