#include <iostream>
using namespace std;

double rdinches();
double inches2cm(double inches);
void outputCm(double cm);

int main()
{
  double inches,cm;
  while(1){
    inches = rdinches();
    if ( inches <= 0 ) break;
    cm = inches2cm(inches);
    outputCm(cm);
  }

  return 0;
}

#ifdef TEST
double rdinches(){
  double inches;
  cout << "Give me a number in inches ";
  cin >> inches;
  return inches;
}

double inches2cm(double inches){
  return 2.0;
}

void outputCm(double cm){
  cout << "outputCm called\n";
}
#endif