Chapter 3, Problem 1PP

A liter is 0.264179 gallons. Write a program that will read in the number of liters of gasoline consumed by the user’s car and the number of miles traveled by the car and will then output the number of miles per gallon the car delivered. Your program should allow the user to repeat this calculation as often as the user wishes. Define a function to compute the number of miles per gallon. Your program should use a globally defined constant for the number of liters per gallon.

Program Plan Intro

List of variables:

number_of_miles: Store the number of miles travelled.

liter_of_gas: Store the quantity of gasoline consumed.

List of functions used:

cout.setf(ios::showpoint): For controlling the floating and trailing zeros.

cout.precision(2): Dislay the values up to two digits.

cin(): To take input from input streams like keyboard, files etc.

cout(): To display the output.

Summary Introduction:

Program will use the Main () method to prompt the user to enter the number of miles traveled and the number of gasoline consumed to find the number of miles per gallon car delivered. A liter is equal to 0.264179 gallons.

Program Description:

The purpose of the program is to find the number of miles per gallon car delivered.

Explanation of Solution

Program:

Following is the C++ program to find the number of miles per gallon car delivered.

/*

* Program: The program asks user to provide the number of miles car travelled and the amount of gasoline consumed to find the number of miles per gallon car delivered.

*/

#include <iostream>
Usingnamespacestd;
constdouble LITRE =0.264179;
// A liter is equal to 0.264179 gallons
doublemiles_per_gallons(float,float);
intmain(){
cout.setf(ios::fixed);
cout.setf(ios::showpoint);
cout.precision(2);
charans;
do{
// declare the variables.
Floatnumber_of_miles,liter_of_gas;
cout<<"Enter the number of miles traveled: ";
cin>>number_of_miles;
cout<<"\nEnter the number of liters of gasoline consumed: ";
cin>>liter_of_gas;
cout<<endl<<miles_per_gallons(number_of_miles,liter_of_gas);
cout<<endl<<"Do you want to calculate again? ";
cin>>ans;
}while(ans=='Y'||ans=='y');
cout<<"\nThank You!";
return0;
}
// function to calculate the miles per gallon car delivered.
doublemiles_per_gallons(floatnumber_of_miles,floatliter_of_gasoline){
returnnumber_of_miles/(liter_of_gasoline*LITRE);
}

Explanation:

The above program prompts the user to enter the number of miles traveled and the number of gasoline consumed and after that function miles_per_gallons() is defined to find the number of miles traveled by gasoline consumed in liter. Then cout() function is used to show the output of the program.

Sample Output:

Following is the sample output for the given program:

Enter the number of coupons: 25 
The number of Candy bars: 2 
The number of Gum Balls: 1 
The remaining coupons are: 2