Design, edit, compile, and execute a C++ application that gives a menu with thre

Question

Design, edit, compile, and execute a C++ application that gives a menu with three options:

--- 1. Create a sequential data file has the information about the items of store. The information will be item description (should be its name), quantity, and price.

--- 2. Read an existing data file with the information of the items of the store (item description, quantity, and price). In this option, the user can enter a quantity by keyboard and the program will shows the list of items quantity is less than a given one.

--- 3. Exit

The application must contemplate handling exceptions with the data files used. For example, create a data file that exists, open a data file that does not exist, and others.

Explanation / Answer

#include<iostream.h>
#include<conio.h>
#include<stdlib.h>       \header file for exit function
#include<fstream>        \header file for reading and writing to file

using namespace std;

char na[10][25];
int q[25];               \global variables for storing values in files
int p[25];

void main()
{
while(1)                \for displaying menu
   {
    cout<<"Choose one of the options from below:"
    cout<<"--- 1. Create a sequential data file has the information about the items of store. The information will be item description (should be its name), quantity, and price. ";
    cout<<"--- 2. Read an existing data file with the information of the items of the store (item description, quantity, and price). In this option, the user can enter a quantity by keyboard and the program will shows the list of items quantity is less than a given one.";
    cout<<"--- 3. Exit";
    cin>>n;
    switch(n)              \ for choosing one of the options
     {
      case 1:
       create();
      case 2:
       read();
      case 3:
       exit();
     }
   }
}

void create()
{
bool b = true;
int num;
char name[20];
while(b)
{
cout<<"Enter the name of the file to be created: ";
cin>>name;
if (std::ifstream(name))       \checking whether there is some file of the same name already or not
     std::cout << "File already exists Enter some other name: ";
else
   b=false;
}
ofstream wr;
wr.open(name,ios::out)     \opening the file in write mode
cout<<"Enter the number of items for which you want to insert data ";
cin>>num;
cout<<"Enter the name, quantity and price of the items respectively ";
for(int i=0; i<n; i++)
   {
   cin>>na[][i]>>q[i]>>p[i];   \taking input from the user
   wr<<na[][i]<<q[i]<<p[i];    \writing to the file
   }
cout<<"Data to the file"<<name<<" has been successfully written. ";
wr.close();
}

void read()
{
int qu;
bool b = true;
char name[20];
int myquan[25];    \ for reading from the file
while(b)
{
cout<<"Enter the name of the file to be opened ";
ifstream re(name);
    if(re.fail())
      cout<<"File does not exist Enter some other name ";
    else
      b=false;
}    
re.open(name);
cout<<"Enter the quantity which is to be compared ";
cin>>qu;
cout<<"Here is the list of items' quantity with quantity less than the above mentioned value";
for(int i=0;;i++)
{
   re>>myquan[i];   \copying the quantity from file to array
   if(qu>q[i])
    cout<<q[i];
}
}

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