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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4. void encrypt(char *cleartext, char *chiffre, int keyOffset) {
  5.     while (keyOffset > 25) {
  6.         keyOffset = keyOffset - 26;
  7.     }
  8.  
  9.  
  10.     for (int i = 0; cleartext[i] != '\0'; i++) {
  11.         if (cleartext[i] > 64 && cleartext[i] < 91) {
  12.             chiffre[i] = cleartext[i] + keyOffset;
  13.             if (chiffre[i] > 90) {
  14.                 chiffre[i] = chiffre[i] - 26;
  15.             }
  16.         } else {
  17.             if (cleartext[i] > 96 && cleartext[i] < 123) {
  18.                 chiffre[i] = cleartext[i] + keyOffset;
  19.                 if (chiffre[i] > 123) {
  20.                     chiffre[i] = chiffre[i] - 26;
  21.                 }
  22.             } else chiffre[i] = cleartext[i];
  23.         }
  24.     }
  25.     printf("%s", chiffre); // drückt den Wert von chiffre aus.
  26. }
  27.  
  28.  
  29. void decrypt(char *chiffre, char *cleartext, int keyOffset) {
  30.     //TODO:implement decryption algorithmus for your symmetric cypher
  31.  
  32.     while (keyOffset > 25) {
  33.         keyOffset = keyOffset - 26;
  34.     }
  35.  
  36.  
  37.     for (int i = 0; chiffre[i] != '\0'; i++) {
  38.         if (chiffre[i] > 64 && chiffre[i] < 91) {
  39.             chiffre[i] = chiffre[i] + keyOffset;
  40.             if (chiffre[i] > 90) {
  41.                 chiffre[i] = chiffre[i] + 26;
  42.             }
  43.         } else {
  44.             if (chiffre[i] > 96 && chiffre[i] < 123) {
  45.                 chiffre[i] = chiffre[i] + keyOffset;
  46.                 if (chiffre[i] > 123) {
  47.                     chiffre[i] = chiffre[i] + 26;
  48.                 }
  49.             } else chiffre[i] = cleartext[i];
  50.         }
  51.     }
  52.     printf("%s", cleartext);
  53.  
  54. }
  55.  
  56. int main() {
  57.     //TODO: test
  58.     char buffer[15];
  59.     encrypt("Hello Mr. X!", buffer, 3);
  60.     decrypt("Khoor Pu. A!", buffer, 3);
  61.     return 0;
  62. }
  63.  
Runtime error #stdin #stdout 0s 4276KB
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Standard input is empty
stdout
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Standard output is empty
https://ideone.com/pOVD75
language:
C (gcc 8.3)
created:
6 years ago
visibility:
public

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