double cm2inches(double cm){
  return (cm/2.54);
}

#ifdef TEST
#include <iostream>
using namespace std;

int main()
{
  double cms,inches;
  while(1){
    cout << "Give me a value in cms ";
    cin >> cms;
    inches = cm2inches(cms);
    cout << "The converted value is " << inches << endl;
  }
  return 0;
}
#endif