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tellg() function in C++ with example

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The tellg() function is used with input streams, and returns the current “get” position of the pointer in the stream. It has no parameters and returns a value of the member type pos_type, which is an integer data type representing the current position of the get stream pointer.

Syntax:-

pos_type tellg(); 

Returns: The current position of the get pointer on success, pos_type(-1) on failure.

Example 1




// C++ program to demonstrate 
// example of tellg() function.
#include <bits/stdc++.h>
using namespace std;
  
int main()
{
    string str = "geeksforgeeks";
    istringstream in(str);
  
    string word;
    in >> word;
    cout << "After reading the word \"" << word
        << "\" tellg() returns " << in.tellg() << '\n';
}


Output:

After reading the word "geeksforgeeks" tellg() returns -1

Example 2 :




// C++ program to demonstrate 
// example of tellg() function.
#include <bits/stdc++.h>
using namespace std;
  
int main()
{
    string str = "Hello, GFG";
    istringstream in(str);
  
    string word;    
    in >> word;
      
    cout << "After reading the word \"" << word
        << "\" tellg() returns " << in.tellg() << '\n';
}


Output:

After reading the word "Hello," tellg() returns 6

Properties:-
tellg() does not report the size of the file, nor the offset from the beginning in bytes. It reports a token value which can later be used to seek to the same place, and nothing more. (It’s not even guaranteed that you can convert the type to an integral type)



Last Updated : 05 Jun, 2018
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