Authors:
Walter Savitch ,julia Lobur
Chapter:
Procedural Abstraction And Functions That Return A Value
Exercise:
Programming Projects
Question:2 | ISBN:9780321531346 | Edition: 7
Question
Modify your program from Programming Project 1 so that it will take input data for two cars and output the number of miles per gallon deliv-ered by each car. Your program will also announce which car has the best fuel efficiency (highest number of miles per gallon).
Answer
Program:
#include<iostream>
using namespace std;
#define LITERPERGALLON (3.785)
double mpg(double m,double l)
{
return (m*LITERPERGALLON/l);
}
void main()
{
double fliters,fmiles,sliters,smiles,fmpg,smpg;
char choice;
do
{
cout<<"Enter miles traveled by first car"<<endl;
cin>>fmiles;
cout<<"Enter liters gasoline:"<<endl;
cin>>fliters;
cout<<"Enter miles traveled by second car"
<<endl;
cin>>smiles;
cout<<"Enter in liters gasoline:"<<endl;
cin>>sliters;
if (fliters == 0 || sliters == 0)
cout<<"\n Invalid input";
else
{
fmpg = mpg (fmiles,fliters);
smpg = mpg (smiles,sliters);
cout<<"Miles per gallon "<<fmpg<<endl;
cout<<"Miles per gallon "<<smpg<<endl;
}
if(fmpg == smpg)
{
cout<<"Both cars are best."<<endl;
}
else if(fmpg > smpg)
{
cout<<"First car is best."<<endl;
}
else
cout<<"Second car is best."<<endl;
cout<<"To continue then enter 'Y' or 'y'"<<endl;
cin>>choice;
} while(choice =='y'|| choice =='Y');
}
Output:
Enter miles traveled by first car
1000
Enter liters gasoline:
500
Enter miles traveled by second car
2000
Enter in liters gasoline:
200
Miles per gallon 7.57
Miles per gallon 37.85
Second car is best.
To continue then enter 'Y' or 'y'
n