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Software Design Using C++

Review of Functions and Parameters

Answering the Question

Your rewrite of the CalculateCost function was as follows. Then you chose Answer B, also shown below, for your rewrite of the Results function. This is incorrect as it tries to call CalculateCost with 3 parameters when it is supposed to have only 2. In addition, CalculateCost returns its answer in the function name, but the function call inside of Results does not use the return value. Finally, note that TotalCost is not listed as a reference parameter and hence fails to send the updated value back. Go back and try this part again.

float CalculateCost(float Price, int NumPurchased)
   float TempCost;

   TempCost = Price * NumPurchased;
   if (TempCost > 80.0)
      TempCost = TempCost - 5.0;

   return TempCost;

void Results(float Price, int NumPurchased, float TotalCost)
   float Cost;

   CalculateCost(Price, NumPurchased, Cost);
   TotalCost = TotalCost + Cost;
   cout << "Unit price: " << Price << "   Number purchased: "
      << NumPurchased << "   Cost: " << Cost << endl << endl;

You can go back to the overall review listing: Review of Introductory Topics.

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Author: Br. David Carlson with contributions by Br. Isidore Minerd
Last updated: January 15, 2013