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std:: clearerr

From cppreference.net
< cpp ‎ | io ‎ | c
C++
Input/output library
C-style I/O
Defined in header <cstdio>
void clearerr ( std:: FILE * stream ) ;

Resets the error flags and the EOF indicator for the given file stream.

Contents

Parameters

stream - the file to reset the error flags for

Return value

(none)

Example

Run this code 
#include <cassert>
#include <cstdio>
int main()
{
    std::FILE* tmpf = std::tmpfile();
    std::fputs("cppreference.net\n", tmpf);
    std::rewind(tmpf);
    for (int ch; (ch = std::fgetc(tmpf)) != EOF; std::putchar(ch)) { }
    assert(std::feof(tmpf)); // the loop is expected to terminate by EOF
    std::puts("End of file reached");
    std::clearerr(tmpf); // clear EOF
    std::puts(std::feof(tmpf) ? "EOF indicator set"
                              : "EOF indicator cleared");
}

Output: 

cppreference.net
End of file reached
EOF indicator cleared

See also

checks for the end-of-file
(function)
displays a character string corresponding of the current error to stderr
(function)
checks for a file error
(function)
C documentation for clearerr