SOURCE FILE: conepain.cpp

//******************************************************************
// ConePaint program
// This program computes the cost of painting traffic cones in
// each of three different colors, given the height and diameter
// of a cone in inches, and the cost per square foot of each of
// the paints
//******************************************************************
#include <iostream>
#include <iomanip>    // For setw() and setprecision()
#include <cmath>      // For sqrt()

using namespace std;

const float HT_IN_INCHES = 30.0;    // Height of a typical cone
const float DIAM_IN_INCHES = 8.0;   // Diameter of base of cone
const float INCHES_PER_FT = 12.0;   // Inches in 1 foot
const float RED_PRICE = 0.10;	    // Price per square foot
				    //	 of red paint
const float BLUE_PRICE = 0.15;	    // Price per square foot
				    //	 of blue paint
const float GREEN_PRICE = 0.18;	    // Price per square foot
				    //	 of green paint
const float PI = 3.14159265;	    // Ratio of circumference
				    //	 to diameter
int main()
{
    float heightInFt;	  // Height of the cone in feet
    float diamInFt;	  // Diameter of the cone in feet
    float radius;	  // Radius of the cone in feet
    float surfaceArea;	  // Surface area in square feet
    float redCost;	  // Cost to paint a cone red
    float blueCost;	  // Cost to paint a cone blue
    float greenCost;	  // Cost to paint a cone green

    cout << fixed << showpoint;		   // Set up floating-pt.
					   //	output format

    // Convert dimensions to feet

    heightInFt = HT_IN_INCHES / INCHES_PER_FT;
    diamInFt = DIAM_IN_INCHES / INCHES_PER_FT;
    radius = diamInFt / 2.0;

    // Compute surface area of the cone

    surfaceArea = PI * radius *
		  sqrt(radius*radius + heightInFt*heightInFt);

    // Compute cost for each color

    redCost = surfaceArea * RED_PRICE;
    blueCost = surfaceArea * BLUE_PRICE;
    greenCost = surfaceArea * GREEN_PRICE;

    // Print results

    cout << setprecision(3);
    cout << "The surface area is " << surfaceArea << " sq. ft."
	 << endl;
    cout << "The painting cost for" << endl;
    cout << "	red is" << setw(8) << redCost << " dollars"
	 << endl;
    cout << "	blue is" << setw(7) << blueCost << " dollars"
	 << endl;
    cout << "	green is" << setw(6) << greenCost << " dollars"
	 << endl;
    return 0;
}