[Unicorn]

Writing a function to reverse a string is a good way to get familiar with the language. In future projects however, you might want to use the reverse function from the standard C++ library:

#include <iostream>
#include <algorithm>
#include <cstring>

using namespace std;

int main (int argc, char **argv)
{
  char sentence[100];
  cin.getline (sentence, 100);
  reverse (sentence, sentence + strlen (sentence));
  cout << sentence << endl;
  
  return 0;
}