double inches2cm(double inches){
  return (2.54*inches);
}

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

int main()
{
  double cms,inches;
  while (1){
    cout << "Give me a value in inches ";
    cin >> inches;
    cms = inches2cm(inches);
    cout << "The converted value is " << cms << endl;
  }
  return 0;
}
#endif