Question

in c, what does the feof() function do when used with file streams? question 5 options: opens a file stream sets the file marker to the end-of-file returns a true value if the end-of-file was reached closes a file stream

Answer 1

The feof() function checks if the end-of-file has been reached in a file stream and returns a non-zero value if it has. It is used to determine if all the data has been read from a file.

Step-by-step explanation:

The feof() function in C is used with file streams to check if the end-of-file (EOF) has been reached. When feof() is called, it returns a non-zero value if the end-of-file indicator for the specified stream is set. This typically occurs after an attempt to read past the end of a file. Otherwise, it returns 0. Note that feof() only reports the end-of-file status that is set by another operation; it does not move the file pointer or perform any I/O.

For example, if you're reading through a file using fgetc() or fscanf(), and you reach the end of the file, the subsequent call to feof() will return true (non-zero). It is important to check the return value of the reading operation itself as well to handle any read errors or end-of-file scenarios appropriately.