# std::feof

From cppreference.com
< cpp‎ | io‎ | c

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

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

### Parameters

stream | - | the file stream to check

### Return value

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

### 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 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.

### Example

Run this code

    #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
           std::putchar(c);
        }

        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;
        }

        std::fclose(fp);
        return is_ok;
    }

Output:

    End of file reached successfully

### See also

eof | checks if end-of-file has been reached (public member function of `std::basic_ios<CharT,Traits>`)
clearerr | clears errors (function)
perror | displays a character string corresponding of the current error to stderr (function)
ferror | checks for a file error (function)

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