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  1. #include <iostream>
  2. #include <string>
  3. using namespace std;
  4.  
  5. int main(){
  6.     string plain, paired;
  7.     cout << "input plaintext(no spaces, lowercase):\n";
  8.     cin >> plain;
  9.  
  10.     paired = plain;
  11.     for (string::size_type i = 1; i < paired.size(); ++i){
  12.         if (paired[i] == paired[i-1]){
  13.             paired.insert(i,1,'x');
  14.             // or: paired.insert(paired.begin()+i, 'x');
  15.             // or: paired.insert(i, "x");
  16.             // or: paired.insert(i, string{'x'});
  17.             // or: paired.insert(paired.begin()+i, {'x'});
  18.  
  19.             ++i; // skip the x just inserted
  20.         }
  21.     }
  22.  
  23.     if (paired.size() % 2 != 0){
  24.         paired += 'x';
  25.     }
  26.  
  27.     cout << paired << endl;
  28.     return 0;
  29. }
Success #stdin #stdout 0s 4944KB
comments (?)
stdin
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CoolBoolFallmoose
stdout
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input plaintext(no spaces, lowercase):
CoxolBoxolFalxlmoxosex
https://ideone.com/4ViUWe
language:
C++ 4.3.2 (gcc-4.3.2)
created:
4 years ago
visibility:
public

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