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  1. #include <iostream>
  2. #include <string>
  3.  
  4. using namespace std;
  5.  
  6. int main ()
  7. {
  8.     string s;
  9.  
  10.     cout << "The string is: " << endl;
  11.     cin >> s;
  12.  
  13.     string::size_type pos = 0;
  14.     do {
  15.         pos = s.find('a', pos);
  16.         if (pos == string::npos) break;
  17.         s.insert(pos, "aa");
  18.         // or: s.insert(pos, 2, 'a');
  19.         pos += 3;
  20.     }
  21.     while (true);
  22.  
  23.     cout << "The modified string is: " << endl;
  24.     cout << s;
  25. }
Success #stdin #stdout 0s 4996KB
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stdin
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water
stdout
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The string is: 
The modified string is: 
waaater
https://ideone.com/JNQ8j6
language:
C++ 4.3.2 (gcc-4.3.2)
created:
3 years ago
visibility:
public

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