From cppreference.com
< c‎ | io
Defined in header <stdio.h>
int feof( FILE *stream );

Checks if the end of the given file stream has been reached.


[edit] Parameters

stream - the file stream to check

[edit] Return value

nonzero value if the end of the stream has been reached, otherwise 0

[edit] Notes

This function only reports the stream state as reported by the most recent I/O operation, it does not examine the associated data source. For example, if the most recent I/O was a fgetc, which returned the last byte of a file, feof returns zero. The next fgetc fails and changes the stream state to end-of-file. Only then feof returns non-zero.

In typical usage, input stream processing stops on any error; feof and ferror are then used to distinguish between different error conditions.

[edit] Example

#include <stdio.h>
#include <stdlib.h>
int main(void)
    FILE* fp = fopen("test.txt", "r");
    if(!fp) {
        perror("File opening failed");
        return EXIT_FAILURE;
    int c; // note: int, not char, required to handle EOF
    while ((c = fgetc(fp)) != EOF) { // typical file reading loop
    if (ferror(fp))
        puts("I/O error when reading");
    else if (feof(fp))
        puts("End of file reached successfully");

[edit] See also

clears errors
displays a character string corresponding of the current error to stderr
checks for a file error