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Magazine Chapter 13: Problem 33
The __ member function returns a file's current read position.
Short Answer
Expert verified
Answer: To use the "tellg()" member function in C++, perform the following steps:
1. Include header files: Include the "iostream" for input/output operations and "fstream" for file handling operations.
2. Open a file for reading: Open a file using an ifstream object.
3. Check if the file is open: Make sure the file is open before performing any read operations.
4. Use "tellg()" to get the current read position: Call the "tellg()" function on the input file stream object.
5. Output the current read position: Display the current read position to the user.
6. Close the file: Close the file after performing the required operations.
Here's an example:
```cpp
#include
#include
int main() {
std::ifstream inputFile("file.txt", std::ios::in);
if (!inputFile.is_open()) {
std::cerr << "Error opening file" << std::endl;
return 1;
}
std::streampos currentPosition = inputFile.tellg();
std::cout << "Current read position: " << currentPosition << std::endl;
inputFile.close();
return 0;
}
```
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