This C++ program defines an inventory class with data members to store item name, quantity, price, and total amount. It uses file handling operations to write inventory objects to a text file and read from the file to display the stored data. The main function contains a menu to allow the user to choose between writing data to the file, reading from the file to display the stored items, or exiting the program.

1. oop_1
#include <iostream>
#include <fstream>
using namespace std;
class inventory
{
char name[20];
int qty;
double price,total;
public:
void getdata()
{
cout<<"enter Name "; cin>>name;
cout<<"Enter Qty ";cin>>qty;
cout<<"Enter price ";cin>>price;
total=qty*price;
}
void putdata()
{
cout.setf(ios::left,ios::adjustfield);
cout.width(15);
cout<<name;
cout.width(10);
cout<<price;
cout.width(10);
cout<<qty;
cout.width(10);
cout<<total;
cout<<endl;
}
};
int main()
{
int i=0;int ch;
fstream inout;
inventory item[5];
//inout.open("stock.txt",ios::in|ios::out);
do
{
cout<<"File Handling with Class"<<endl;
cout<<"Menu for File Operation"<<endl;
cout<<"1. Write Data into File"<<endl;
cout<<"2. Read Data From File"<<endl;
cout<<"3. Exit "<<endl;
cout<<"Enter your Choice "; cin>>ch;
switch(ch)
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2. oop_1
{
case 1:
{
inout.open("stock.txt",ios::in|ios::out|ios::ate);
//cout<<tellp();
item[i].getdata();
inout.write((char *)& item[i], sizeof(item[i]));
i++;
inout.clear();
inout.close();
break;
}
case 2:
{
inout.open("stock.txt",ios::in);
inout.seekg(0,ios::beg);
cout.setf(ios::left,ios::adjustfield);
cout.width(15);cout<<"Item Name";
cout.width(10);cout<<"Price";cout.width(10);cout<<"Qty";cout.width(15);cout<<"Total
Amt"<<endl;
cout.width(55);
cout.fill('-');
cout<<"-"<<endl;
cout.fill(' ');
for(int j=0;j<=i;j++)
{
while(inout.read((char *)& item[i],sizeof(item[i])))
{
item[i].putdata();
}
}
inout.close();
break;
}
case 3:
{
return 0;
}
default:
{
cout<<"Enter valid choice "<<endl;
break;
}
}
}while(true);
return 0;
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3. oop_1
}
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