Chapter 4.4, Problem 19STE

Explanation of Solution

The function “unitPrice()” with “static_cast<double>(2)” is executed in the C++ language which gives the output as follows,

// Include required header files

#include <iostream>

using namespace std;

// Declaration of unitPrice() function

double unitPrice(int diameter, double price);

// Definition of unitPrice() function

double unitPrice(int diameter, double price){

  // Define a constant value for PI

  const double PI = 3.14159;

  // Declare the variables

  double radius, area;

  // Compute radius

  radius = diameter/static_cast<double>(2);

  // Compute area

  area = PI * radius * radius;

  // Compute the unit price and return the result

  return (price/area);

}

// Definition of main() function

int main() {

// Call the unitPrice() function and display the result

  cout << "Price: " << unitPrice(13, 14) <<"\n";

  // Return 0

  return 0;

}

Output for the above function is as follows,

Price: 0.105476

The function “unitPrice()” with the constant “2...