Chapter 10: Problem 16

What is the purpose of the eof function?

Short Answer

Expert verified

The purpose of the eof() function is to check if a file stream has reached its end while reading data from a file. This function helps in determining whether there is any more data left to read or not and is typically used as a break condition for loops that process file data. It returns true when the end of the file is reached, and false otherwise.

Step by step solution

Definition of eof() Function

The eof() function, short for "end-of-file," is a standard library function in various programming languages, including C and C++, that checks if a file stream has reached its end. When reading from a file, it becomes necessary to know if the data has been entirely read, and the eof() function serves this purpose.

Usage of eof() Function

The eof() function returns true (a non-zero value) when the end of the file is reached, and false (zero) otherwise. It is commonly used in loops when reading from a file, as it provides a break condition to exit the loop when there is no more data left to read.

Example in C++

Here is a simple example of how the eof() function is used to read data from a file in C++: ```cpp #include #include int main() { std::ifstream inputFile("sample.txt"); std::string line; while (!inputFile.eof()) { std::getline(inputFile, line); std::cout << line << std::endl; } inputFile.close(); return 0; } ``` In this example, the eof() function is used as the condition for the while loop. As long as the end of the file has not been reached, the loop will continue reading and printing lines of data from the sample.txt file. When the eof() function returns true, the loop will exit, and the program will finish reading the file.

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What is the purpose of the eof function?

Short Answer

Step by step solution

Definition of eof() Function

Usage of eof() Function

Example in C++

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