4. Aaron Lakely is going to the grocery store to buy some bananas and apples, bo

Question

4. Aaron Lakely is going to the grocery store to buy some bananas and apples, both of
which are sold by the pound. He wants a program that calculates and displays the total
cost of his order, including a 3% sales tax. First, create an IPO chart for this problem,
and then desk-check the algorithm twice. For the first desk-check, use 2 and 3.5 as the
number of pounds of bananas and apples, respectively. And use $0.99 and $1.89 as the
price per pound of bananas and apples, respectively. For the second desk-check, use
your own set of data. After desk-checking the algorithm, list the input, processing, and
output items in a chart similar to the one shown in Figure 3-25, and then enter the
appropriate C++ declaration statements.

Explanation / Answer

IPO chart for the program

----------------------------------------------------------------------------------------------------------
Input                                  Processing                                                 Output
----------------------------------------------------------------------------------------------------------
sales tax=0.03                                                                                             totalcost
bananas (in pounds)      
apples(in pounds)
POUND_BANANA=0.99
POUND_APPLE=1.89
                                            1.Enter bananas in pounds
            2.Read bananas
               3.Enter apples in pounds
         4.Read apples
            5.Calculate multiply the banans by POUND_BANANA
               and apples by POUND_APPLE and then sum.
               cost=banans*POUND_BANANA+apples*POUND_APPLE
         6. tax=cost*salesTax
            7. Find the total cost as sum of banans and apples withe sales tax
                totalcost=cost+tax
          

---------------------------------------------------------------------------------------------------------------------------------------------
First desk-check calculation

Number of bananas=2
Number of apples=3.5
cost=2*0.99+3.5*1.89
cost=1.98+6.615
cost=8.595
sales tax=0.257
totalcost=8.595+0.257
totalcost=8.852

Second desk-check calculation

Number of bananas=5
Number of apples=5.5
cost=5*0.99+5.5*1.89
cost=4.95+10.395
cost=15.345
sales tax=0.460
totalcost=15.345+0.460
totalcost=15.80535

------------------------------------------------------------------------------
//C++ program to find the total cost of the Aaron Lakely's purchase

//C++ declaration statements to find the total cost of the itesm purchased.
#include<iostream>
using namespace std;
int main()
{

   //declaration of constants
   const double SALESTAX=0.03;
   const double POUND_BANANA=0.99;
   const double POUND_APPLE=1.89;
  
   double tax=0;
   double cost=0;
   double totalcost=0;
   double bananas_in_pounds;
   double apples_in_pounds;
  

   cout<<"Enter number of bananas( in pounds) : ";
   //read bananas in pounds
   cin>>bananas_in_pounds;

   cout<<"Enter number of apples( in pounds) : ";
   //read apples in pounds
   cin>>apples_in_pounds;

   //calculate the cost
   cost=bananas_in_pounds*POUND_BANANA+apples_in_pounds*POUND_APPLE;

   //calculate tax
   tax=cost*SALESTAX;

   //print total cost
   cout<<"Total cost : $"<<(cost+tax)<<endl;

   system("pause");
   return 0;
}

--------------------------------------------------------------------------------------------------------------------------------
Sample output:
Enter number of bananas( in pounds) : 2
Enter number of apples( in pounds) : 3.5
Total cost : $8.85285

sample run2:
Enter number of bananas( in pounds) : 5
Enter number of apples( in pounds) : 5.5
Total cost : $15.8053

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