// Ex5_12.cpp
#include <iostream>
using std::cout;
using std::endl;

double* treble(double);                   // Function prototype

int main(void)
{
   double num(5.0);                       // Test value
   double* ptr(nullptr);                  // Pointer to returned value

   ptr = treble(num);

   cout << endl << "Three times num = " << 3.0*num;

   cout << endl << "Result = " << *ptr;   // Display 3*num

   cout << endl;
   return 0;
}

// Function to treble a value - mark 1
double* treble(double data)
{
   double result(0.0);
   result = 3.0*data;
   return &result;
}