Question

C++ programming:

One line per input/output variable with the exact variable name followed by a description

1. [8 points] Write a program that reads data from the file data.in. The file consists of an unknown number of lines each of which contains the unit price and the quantity of an item. For example, if the file data.in contained the following data: 16.00 24 7.47 13 2.10 15 12.47 18 Your program should output the following to your screen Unit Price 16.00 7.47 2.10 12.47 Quantity 24 13 15 18 Item Total 384.00 97.11 31.50 224.46 Item Number 2 GST 36.85 Grand Total 773.92

Answer 1

Hi, Please find my program.

Please let me know in case of any issue:

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

int main(){

   // declaring and opening output file
   ifstream inFile;

   inFile.open("data.in");

   // setting precision of double number to 2
   cout <<setprecision(2) <<fixed;

   // file opening error checking
   if(inFile.fail()){
       cout<<"Error in opening file"<<endl;
       return -1;
   }

   int quantity;
   double unitprice;
   double GST = 36.85;
   double grandTotal = GST; // to store total of all

   cout<<"Item Number   "<<"Unit Price   "<<"Quantity "<<"Item Total"<<endl;
   int count = 1;// counter
   // reading all lines
   while(inFile>>unitprice>>quantity){
       double price = unitprice*quantity;
       grandTotal = grandTotal + price;
       cout<<count<<"\t\t"<<unitprice<<"\t\t"<<quantity<<"\t\t"<<price<<endl;
       count++;
   }
   // closing file
   inFile.close();
   cout<<"\n\t\t\t\tGST\t"<<GST<<endl;
   cout<<"\t\t\t\tGrand Total\t"<<grandTotal<<endl;

   return 0;
}