seekg() is a function in the iostream library (part of the standard library) that allows you to seek to an arbitrary position in a file. It is used in file handling to sets the position of the next character to be extracted from the input stream from a given file. For example :
Input : "Hello World" Output : World
Syntax – There are two syntax for
seekg() in file handling :
istream&seekg(streamoff offset, ios_base::seekdir dir);
- position : is the new position in the stream buffer.
- offset : is an integer value of type streamoff representing the offset in the stream’s buffer. It is relative to the dir parameter.
- dir : is the seeking direction. It is an object of type ios_base::seekdir that can take any of the following constant values.
There are 3 direction we use for offset value :
ios_base::beg(offset from the beginning of the stream’s buffer).
ios_base::cur(offset from the current position in the stream’s buffer).
ios_base::end(offset from the end of the stream’s buffer).
If we previously get an end of file on the stream, seekg will not reset it but will return an error in many implementations. – use the
clear() method to clear the end of file bit first. This is a relatively common mistake and if
seekg() is not performing as expected.
This article is contributed by Shivani Baghel. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to email@example.com. See your article appearing on the GeeksforGeeks main page and help other Geeks.
Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above.
- File Handling through C++ Classes
- tellp() in file handling with c++ with example
- Four File Handling Hacks which every C/C++ Programmer should know
- C program to copy contents of one file to another file
- Exception Handling in C++
- C++ | Signal Handling
- Comparison of Exception Handling in C++ and Java
- Exception handling and object destruction | Set 1
- Socket Programming in C/C++: Handling multiple clients on server without multi threading
- Reverse an array upto a given position
- kbhit in C language
- Convert C/C++ code to assembly language
- Why C++ is partially Object Oriented Language?
- What is size_t data type in C language?
- C program to delete a file