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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.replace(pos, 1, "aaa");
  18.         pos += 3;
  19.     }
  20.     while (true);
  21.  
  22.     cout << "The modified string is: " << endl;
  23.     cout << s;
  24. }
Success #stdin #stdout 0s 5040KB
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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/kzPMJs
language:
C++ 4.3.2 (gcc-4.3.2)
created:
3 years ago
visibility:
public

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