#include
#include
#include
#include
#include
class inventory //class specification
{
char name[10];
int code;
float cost;
public: //public members
void getdata(void)
{
cout<<"\nenter name:\n";
cin>>name;
cout<<"\nenter code:\n";
cin>>code;
cout<<"\nenter cost:\n";
cin>>cost;
}
void putdata(void)
{
cout<}
};
void main()
{
clrscr();
inventory item; //creation of object
fstream inoutfile; //creation of filestream object
inoutfile.open("STOCK dat",ios::ate|ios::in|ios::out|ios::binary); //member function open with file modes
inoutfile.seekg(0,ios::beg); //file pointers
cout<<"\ncurrent content of stack\n";
while(inoutfile.read((char*)&item,sizeof(item))) //reading of data
{
item.putdata(); //accessing member function
}
inoutfile.clear(); //closing the file
/* add one more item */
cout<<"\nadd an item\n\n";
item.getdata();
char ch;
cin.get(ch); //unformatted i/o operation
inoutfile.write((char *)&item,sizeof(item));
/* display the appended file */
inoutfile.seekg(0);
cout<<"\ncontents of appended file\n";
while(inoutfile.read((char *)&item,sizeof(item)))
{
item.putdata();
}
/*find no. of objects in file*/
int last=inoutfile.tellg();
int n=last/sizeof(item);
cout<<"\nnumber of objetcs="<
/*modify the details of an item*/
cout<<"total bytes in the file="<cout<<"\n enter object no. to be updated\n\n" ;
int object;
cin>>object;
cin.get(ch);
int location=(object-1)*sizeof(item);
if(inoutfile.eof())
inoutfile.clear();
inoutfile.seekp(location);
cout<<"enter new value of the object\n";
item.getdata();
cin.get(ch);
inoutfile.write((char *)&item,sizeof(item))<
/*show updated file*/
inoutfile.seekg(0);
cout<<"\ncontents of updated file\n";
while(inoutfile.read((char *)&item,sizeof(item)))
{
item.putdata();
}
inoutfile.close();
getch();
}
Output :
Current contents of the stack :
Suresh 80 1000
Add an item :
Enter the name : Dwarakh
Enter the code : 83
Enter the cost : 1900
Contents of the stack :
Suresh 80 1000
Dwarakh 83 1900
Number of objects = 2
Number of bytes o the file = 32
Enter the object to be updated : 1
To update an item :
Enter the name : Vijay
Enter the code : 86
Enter the cost : 1950
Contents of the updated file :
Vijay 86 1950
Dwarakh 83 1900
|
No feedbacks found. Be the first to respond and make money from revenue sharing program.
|