Question

The Gas-N-Clean Service Station sells gasoline and has a car wash. Fees for the car wash are $1.25 with a gasoline purchase of $10.00 or more and $3.00 otherwise. Three kinds of gasoline are available: regular at $2.89, plus at $3.09, and super at $3.39 per gallon.

User Request:

Write a program that prints a statement for a customer.

Analysis:

Input consists of number of gallons purchased (R, P, S, or N for no purchase), and car wash desired (Y or N). Gasoline price should be program defined constant. Sample output for these data is

Enter number of gallons and press <Enter> 9.7

Enter gas type (R, P, S, or N) and press <Enter> R

Enter Y or N for car wash and press <Enter> Y

**************************************

* *

* *

* Gas-N-Clean Service Station *

* *

* March 2, 2004 *

* *

**************************************

Amount Gasoline purchases 9.7 Gallons

Price pre gallons $ 2.89

Total gasoline cost $ 28.03

Car wash cost $ 1.25

Total due $ 29.28

Thank you for stopping

Please come again

Remember to buckle up and drive safely

program used is c++

Answer 1

CODE:

#include<iostream>
#include<iomanip>
using namespace std;

int main()
{
double numOfGallons;
char gasType, isCarWashNeeded;
double pricePerGallon=0.0,totalGasCost=0.0,costForCarWash=0.0,totalDue;

//constants to hold gasoline price

const double RegularGaslineCost = 2.89;
const double PlusGaslineCost = 3.09;
const double SuperGaslineCost = 3.39;
//read the number of gallons purchased
cout<<"Enter number gallons and press <Enter>: ";
cin>>numOfGallons;
//read the has type
cout<<endl<<"Enter gas type (R,P,S or N) and press <Enter>: ";
cin>>gasType;
//read if car wash is needed or not
cout<<endl<<"Enter Y or N for car wash and press <Enter>: ";
cin>>isCarWashNeeded;

//if gastype is R
if(gasType=='r' || gasType=='R')
{
//calulate total gas cost
totalGasCost=RegularGaslineCost * numOfGallons;   
}
//if gastype is P
else if(gasType=='p' || gasType=='P')
{  
//calulate total gas cost
totalGasCost=PlusGaslineCost * numOfGallons;
}  
//if gastype is S
else if(gasType=='S' || gasType=='s')
{
//calulate total gas cost
totalGasCost=SuperGaslineCost * numOfGallons;   
}
//if gastype is N
else if(gasType=='N' || gasType=='n')
{
//set price per gallon to 0
totalGasCost=0;
}
//else print error message and terminate program  
else
{
cout<<"\nInvalid input. Try again..";
return 0;
}
  
//check if car wash is needed
if(isCarWashNeeded=='Y' || isCarWashNeeded=='y')
{
//if gaa cost is 10 or above
if(totalGasCost>=10)
{
//car wash is 1.25
costForCarWash=1.25;
}
else
{
//else car wash is 3.00
costForCarWash=3.00;
}
}
//if car wash is not needed set wash price to 0
else
{
costForCarWash=0.00;
}
  
//calculate total amount due
totalDue=totalGasCost+costForCarWash;
  
//print the ouput
  
cout<<"\n*****************************************\n";
cout<<"\n*\tGas-N-Cleas Service Station\t*\n";
cout<<"\n*\tMarch 2, 2004\t\t\t*\n";
cout<<"\n*****************************************\n";
cout<<"\nAmount of Gasoline purchase\t"<<numOfGallons<<" Gallons"<<endl;
if(gasType=='R' || gasType=='r')
cout<<"\nPrice per gallon \t\t"<<" $"<<RegularGaslineCost<<endl;
if(gasType=='p' || gasType=='P')
cout<<"\nPrice per gallon \t\t"<<" $"<<setprecision(2)<<PlusGaslineCost<<endl;
if(gasType=='s' || gasType=='S')
cout<<"\nPrice per gallon \t\t"<<" $"<<setprecision(2)<<SuperGaslineCost<<endl;
if(gasType=='n' || gasType=='N')
cout<<"\nPrice per gallon \t\t"<<" $"<<setprecision(2)<<pricePerGallon<<endl;
cout<<"\nTotal gasoline cost\t\t"<<" $"<<fixed<<setprecision(2)<<totalGasCost<<endl;
cout<<"\nCar wash cost\t\t\t"<<" $"<<fixed<<setprecision(2)<<costForCarWash<<endl;
cout<<"\nTotal due\t\t\t"<<" $"<<fixed<<setprecision(2)<<totalDue<<endl;
cout<<endl<<"Thank you for stopping"<<endl;
cout<<endl<<"Please come again"<<endl;
cout<<endl<<"Remember to buckle up and drive safely"<<endl;
return 0;
}

OUTPUT: