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  1. // Ceasar Cipher
  2.  
  3. #include <iostream>
  4. using namespace std;
  5.  
  6. string toUpperCase(string text) {
  7.     for (char &ch : text) {
  8.         ch = toupper(ch);
  9.     }
  10.     return text;
  11. }
  12.  
  13. string encrypt(string text, int key) {
  14.     text = toUpperCase(text); // Convert to uppercase
  15.     string result = "";
  16.     for (char ch : text) {
  17.         if (isupper(ch)) {
  18.             result += char((ch - 'A' + key) % 26 + 'A');
  19.         } else {
  20.             result += ch;
  21.         }
  22.     }
  23.     return result;
  24. }
  25.  
  26. string decrypt(string cipher, int key) {
  27.     cipher = toUpperCase(cipher); // Convert to uppercase
  28.     string result = "";
  29.     for (char ch : cipher) {
  30.         if (isupper(ch)) {
  31.             result += char((ch - 'A' - key + 26) % 26 + 'A');
  32.         } else {
  33.             result += ch;
  34.         }
  35.     }
  36.     return result;
  37. }
  38.  
  39. int main() {
  40.     string name = "AtulMangla";  // lowercase + uppercase mix
  41.     int key = 3;
  42.  
  43.     string cipherText = encrypt(name, key);
  44.     cout << "Cipher Text: " << cipherText << endl;
  45.  
  46.     string decodedText = decrypt(cipherText, key);
  47.     cout << "Decoded Text: " << decodedText << endl;
  48.  
  49.     return 0;
  50. }
  51.  
Success #stdin #stdout 0.01s 5292KB
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stdin
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Standard input is empty
stdout
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Cipher Text: DWXOPDQJOD
Decoded Text: ATULMANGLA
https://ideone.com/ZOqFXX
language:
C++ (gcc 8.3)
created:
5 days ago
visibility:
public

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