thing

    #include <iostream>
    #include <cctype>

    using namespace std;

    int main(int argc, char* argv[])
    {
      char buffer[100];

      // Get thhe string from the user.
      cout << "Please enter a string: ";
      cin >> buffer;

      // Iterate over the array.
      for(int c = 0; c < 100; ++c) {
        // Change the character to uppercase.
        buffer[c] = toupper(buffer[c]);

        // Switch certain letters with numbers. l33t!
        switch(buffer[c]) {
        case 'A':
          buffer[c] = '4';
          break;

        case 'O':
          buffer[c] = '0';
          break;

        case 'I':
          buffer[c] = '1';
          break;
        }
      }

      // Print it out!
      cout << "Cool, here is your string: " << buffer << "!!!!!" << endl;

      return 0;
    }