Draw the hierarchy chart and design the logic for a program that calculates the

Question

Draw the hierarchy chart and design the logic for a program that calculates the projected cost of an automobile trip. Assume that the user's car travels 20 miles per gallon of gas. Design a program that prompts the user for a number of miles driven and a current cost per gallon. The program computes and displays the cost of the trip as well as the cost if gas prices rise by 10 percent. The program accepts data continuously until 0 is entered for the number of miles. Use appropriate modules, including one that displays End of program when the program is finished.

Explanation / Answer

#include <iostream>

#include <iomanip> // need to include this header file for formatting i/o

#include <string> // need to include this header file to handle strings properly

using namespace std;

// Global variables declared here; these have scope (visibility) in all modules

// declared in this file

int numMilesDriven = 0;double costPerGallon = 0;

double tripCost = 0;double newTripCost = 0;

// Named constants declared/initialized here

const double INCREASE = 0.10;

const int MILES_PER_GALLON = 20;

const string MILES_PROMPT = "Enter the number of miles driven: ";

const string GALLON_PROMPT = "Enter the current cost per gallon: ";

const string END_LINE = "End of program....";

void houseKeeping(); // Function prototype

void detailLoop(); // Function prototype

void endOfJob(); // Function prototype

// MODULE: main()

// This is the main() function which acts primarily as a dispatch module.

// The houseKeeping(), detailLoop() and endOfJob() modules are all called from

// within the main() module.

int main()

{

cout << fixed << setprecision(2) << endl; // I/O formatting here

houseKeeping();

while(numMilesDriven!=0)

{

detailLoop();

}

endOfJob();

// TODO : The main iteration in the program is a while loop; a sentinel value

// of zero is used to terminate the loop. Call the detailLoop() from within this

// while loop.

// TODO: Output the ending output statement

return 0;

}

// MODULE: houseKeeping()

// This module primes the input to our main loop

void houseKeeping()

{

// TODO : prime the input to our main loop

cout << MILES_PROMPT;

cin >> numMilesDriven;

return;

}

// MODULE: detailLoop()

// This module makes the sausage (i.e., prompts for cost of gallon of gas;

// and calculates the trip cost based on miles driven. Also calculates

// the trip cost if the cost per gallon of gas increases by 10%.

void detailLoop()

{

//TODO: Prompt for the cost of a gallon of gas

cout << GALLON_PROMPT;

cin >> costPerGallon;

tripCost = numMilesDriven / MILES_PER_GALLON * costPerGallon;

cout << tripCost;

// TODO: Calculate the trip cost and the trip cost if the cost

// of the gas goes up by 10%

newTripCost = tripCost * (1 + INCREASE);

cout << newTripCost;

// TODO: output the calculated trip costs to the user

cout << MILES_PROMPT;

cin >> numMilesDriven;

// TODO: re-prime your input

return;

}

// MODULE: endOfJob()

// This module prints the ending message when the while loop in main is exited.

void endOfJob(){

// TODO: Output the ending output statement in this module

cout << END_LINE;

return;

}

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