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  1. #include <iostream>
  2. #include <string.h>
  3.  
  4. using namespace std;
  5.  
  6. int main ()
  7. {
  8.     char s[100], t[100];
  9.     int i, j;
  10.  
  11.     cout << "The string is: " << endl;
  12.     cin.get (s, 100);
  13.  
  14.     strcpy (t, s);
  15.     for (i = 0, j = 0; i < strlen (s); i++, j++) {
  16.         if (s[i] == 'a') {
  17.             strcat (strcpy (s + i, "aa"), t + j);
  18.             i += 2;
  19.         }
  20.     }
  21.  
  22.     cout << "The modified string is: " << endl;
  23.     cout << s;
  24. }
Success #stdin #stdout 0s 4700KB
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stdout
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The string is: 
The modified string is: 
waaater
https://ideone.com/ifktbL
language:
C++ 4.3.2 (gcc-4.3.2)
created:
3 years ago
visibility:
public

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