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C++ program to demonstrate example of tellg() and tellp() function

tellg() and tellp() are the predefine functions which tells (returns) the position of the get and put pointers.

C++ program to demonstrate example of tellg and tellp – tellg() and tellp() function example in c++ programming language.

tellg() and tellp() example in c++

//C++ program to demonstrate example of tellg() and tellp() function.

#include <iostream>
#include <fstream>
 
using namespace std;
 
int main()
{
    fstream file;
    //open file sample.txt in and Write mode
    file.open("sample.txt",ios::out);
    if(!file)
    {
        cout<<"Error in creating file!!!";
        return 0;
    }
    //write A to Z
    file<<"ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    //print the position
    cout<<"Current position is: "<<file.tellp()<<endl;
    file.close();
 
    //again open file in read mode
    file.open("sample.txt",ios::in);
    if(!file)
    {
        cout<<"Error in opening file!!!";
        return 0;
    }
    cout<<"After opening file position is: "<<file.tellg()<<endl;
     
    //read characters untill end of file is not found
    char ch;
    while(!file.eof())
    {
        cout<<"At position : "<<file.tellg();   //current position
        file>>ch;   //read character from file
        cout<<" Character \""<<ch<<"\""<<endl;
    }
 
    //close the file
    file.close();
    return 0;
}

Output

Current position is: 26   
After opening file position is: 0   
At position : 0 Character "A"   
At position : 1 Character "B"   
At position : 2 Character "C"   
At position : 3 Character "D"   
At position : 4 Character "E"   
At position : 5 Character "F"   
At position : 6 Character "G"   
At position : 7 Character "H"   
At position : 8 Character "I"   
At position : 9 Character "J"   
At position : 10 Character "K"  
At position : 11 Character "L"  
At position : 12 Character "M"  
At position : 13 Character "N"  
At position : 14 Character "O"  
At position : 15 Character "P"  
At position : 16 Character "Q"  
At position : 17 Character "R"  
At position : 18 Character "S"  
At position : 19 Character "T"  
At position : 20 Character "U"  
At position : 21 Character "V"  
At position : 22 Character "W"  
At position : 23 Character "X"  
At position : 24 Character "Y"  
At position : 25 Character "Z"