C Programming - MCQ Practice Questions

In file handling, what does the 'b' flag in file modes like 'rb' or 'wb' indicate?

Which function is used to read a string from a file, including whitespace characters, up to a maximum length?

In the context of ferror() function, what does it return?

Which mode should be used if you want to read and write to a file without truncating existing content?

What is the purpose of the clearerr() function in file handling?

Consider a scenario where fopen() fails to open a file. Which of the following is the correct way to handle it?

What does ftell() function return?

Which of the following fseek() calls will position the file pointer at the end of the file?

What is the difference between text mode and binary mode when reading files?

Which function is used to read formatted data from a file, similar to scanf() but for files?

What will be the behavior of fgets() when reading from an empty line in a file?

In a program reading a binary file of 1000 integers, fread() is called as: fread(arr, sizeof(int), 1000, fp). If only 500 integers are present, what will fread() return?

Consider using fseek() on a file opened in text mode with SEEK_END and a non-zero offset. What is the standard behavior?

A program writes data using fprintf() and later attempts to read it back. However, the read operation fails intermittently. What could be the most likely cause?

What is the purpose of using fflush() in file handling, and when is it critical to use it?

Which function is used to determine the current position in a file?

What is the correct syntax to open a file named 'data.txt' in read mode?

Which mode allows both reading and writing to a file, creating it if it doesn't exist?

What does the fclose() function do?

A program reads a text file line by line using fgets(). If a line contains more characters than the buffer size, what happens?