PROGRAM 113

Object

Write a program that writes formatted data into a file.
(download example6.txt)

Algorithm

1. Create an ofstream object outFile to handle output operations on a file.
2. Declare a character variable flag and string, name up to 30 characters.
3. Declare integer variable quantity and float variable cost.
4. Open the file named example6.txt using outFile.open().
5. IF the file fails to open,
   • Write “Error: Unable to open the file”.
   • Exit.
   • [End of IF structure.]
6. Set flag = ‘y’.
7. WHILE flag ≠ ‘n’
   • Read name, cost and quantity.
   • Write name, cost and quantity.
   • Read flag.
   • [End of WHILE loop.]
8. Close the file.
9. Exit.

Flowchart

C++ Source Code

// program 113
#include<iostream>
#include <iomanip>
#include <fstream>
using namespace std;

int main()
{
  ofstream outFile("example6.txt");
  char flag, name[30];
  int quantity;
  float cost;
  
  if (!outFile.is_open())
  {
    cout << "Error: Unable to open the file" << endl;
    return 1;
  }

  flag = 'y';
  while (flag != 'n')
  {
    cout << "Please enter the item name: ";
    cin.getline(name, 30);
    cout << "Please enter the cost: ";
    cin >> cost;
    cout << "Please enter the quantity: ";
    cin >> quantity;

    outFile << left << setw(30) << name << fixed << setprecision(2) << setw(10) << cost << setw(10) << quantity << endl;

    cout << "\nDo you have another item name? (y/n): ";
    cin >> flag;
    cin.ignore();  // Ignore the newline character in the input buffer
  }
  outFile.close();
  
  return 0;
}

C Source Code

/*program 113*/
#include<stdio.h>
#include<stdlib.h>

int main()
{
  FILE *fptr;
  char flag, name[30];
  int quantity;
  float cost;

  if((fptr = fopen("example6.txt","w"))==NULL)
  {
     puts("Error: Unable to open the file");
     exit(1);
  }

  flag = 'y';
  while(flag != 'n')
  {
     printf("Please enter the item name: ");
     gets(name);
     printf("Please enter the cost: ");
     scanf("%f", &cost);
     printf("Please enter the quantity: ");
     scanf("%d", &quantity);
     fprintf(fptr, "%s\t %.2f\t %d\n", name, cost, quantity);

     printf("\nDo you have another item name: (y/n) ");
     scanf(" %c", &flag);
     while (getchar() != '\n'); 	// Clear input buffer
     printf("\n");
  }
  fclose(fptr);
}

Output

Input given
Please enter the item name: Hard disk
Please enter the cost: 25.5
Please enter the quantity: 100

Do you have another item name? (y/n): y
Please enter the item name: Network cable
Please enter the cost: 75.0
Please enter the quantity: 15

Do you have another item name? (y/n): y
Please enter the item name: Printer toner
Please enter the cost: 85.25
Please enter the quantity: 3

Do you have another item name? (y/n): n
Output

Hard disk                     25.50     100       
Network cable                 75.00     15        
Printer toner                 85.25     3