// Ex5_11.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 = 0;                       // 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;
}