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  1. #include <stdio.h>
  2. #include <inttypes.h>
  3. #include <ctype.h>  
  4.  
  5. int calculateKey(char letter, int key, int start_key)
  6. {
  7.   key = key == 0 ? start_key : (toupper(letter + 1) - 65) % key;
  8.   key %= 26;
  9.   return key;
  10. }
  11.  
  12. char cntelements(char* element_str)
  13. {
  14.   int elements;
  15.  
  16.   for(elements = 0; element_str[elements] != '\0'; ++elements)
  17.   {
  18.     elements = elements + 1;
  19.   }
  20.  
  21.   return elements;
  22. }
  23.  
  24. char encodeLetter(char letter, int key)
  25. {
  26.   int shiftDirection = (key % 2 == 0) ? key : -key;
  27.   int shifted = letter + shiftDirection;
  28.   int letter_param;
  29.  
  30.   if (letter > 96 && letter < 123)
  31.   {
  32.     if (shifted < 97)
  33.     {
  34.       letter_param = 122 - (97 - shifted) + 1;
  35.     }
  36.  
  37.     else if (shifted > 122)
  38.     {
  39.       letter_param = 97 + (shifted - 122) - 1;
  40.     }
  41.  
  42.     else
  43.     {    
  44.       letter_param = shifted;
  45.     }
  46.     return letter_param;
  47.   }
  48.  
  49.   if (letter > 64 && letter < 91)
  50.   {
  51.     if (shifted < 65)
  52.     {
  53.       letter_param = 90 - (65 - shifted) + 1;
  54.     }
  55.  
  56.     else if (shifted > 90)
  57.     {
  58.       letter_param = 65 + (shifted - 90) - 1;
  59.     }
  60.  
  61.     else
  62.     {    
  63.       letter_param = shifted;
  64.     }
  65.     return letter_param;
  66.   }
  67.  
  68.  
  69.     return letter;
  70. }
  71.  
  72. unsigned int cipher(char* cipher_str, int start_key)
  73. {
  74.   int cntChars = 0;
  75.   int elements = cntelements(cipher_str);
  76.   int i;
  77.   int key = 0;
  78.  
  79.   for(i = 0; i <= elements; i++)
  80.   {
  81.  
  82.     if((cipher_str[i] < 91 && cipher_str[i] > 64) ||
  83.     (cipher_str[i] < 123 && cipher_str[i] > 96))
  84.     {        
  85.       cntChars++;
  86.     }
  87.     key = calculateKey(cipher_str[i], key, start_key);
  88.     printf("%d\n", key);
  89.     cipher_str[i] = encodeLetter(cipher_str[i], key);
  90.   }
  91.  
  92.   return cntChars;
  93. }
  94.  
  95. int main()
  96. {
  97. 	char word[] = "GGGG";
  98. 	cipher(word, 50);
  99. 	printf("%s", word);
  100. }
Success #stdin #stdout 0s 4352KB
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https://ideone.com/ISAkn7
language:
C (clang 8.0)
created:
6 years ago
visibility:
public

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