Defined in header <cstdio>
int feof( std::FILE* stream );

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


stream - the file stream to check

Return value

Nonzero value if the end of the stream has been reached, otherwise ​0​.


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 std::fgetc, which returned the last byte of a file, std::feof returns zero. The next std::fgetc fails and changes the stream state to end-of-file. Only then std::feof returns non-zero.

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


#include <cstdio>
#include <cstdlib>
int main()
    int is_ok = EXIT_FAILURE;
    FILE* fp = std::fopen("/tmp/test.txt", "w+");
    if(!fp) {
        std::perror("File opening failed");
        return is_ok;
    int c; // note: int, not char, required to handle EOF
    while ((c = std::fgetc(fp)) != EOF) { // standard C I/O file reading loop
    if (std::ferror(fp)) {
        std::puts("I/O error when reading");
    } else if (std::feof(fp)) {
        std::puts("End of file reached successfully");
        is_ok = EXIT_SUCCESS;
    return is_ok;


End of file reached successfully

See also

checks if end-of-file has been reached
(public member function of std::basic_ios<CharT,Traits>)
clears errors
displays a character string corresponding of the current error to stderr
checks for a file error
C documentation for feof

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