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Showing content from https://en.cppreference.com/w/cpp/algorithm/ranges/../../../cpp/../cpp/../c/io/clearerr.html below:

clearerr - cppreference.com

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

(none)

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

Output:

cppreference.com
End of file reached
EOF indicator cleared

• C17 standard (ISO/IEC 9899:2018):

• 7.21.10.1 The clearerr function (p: 246)

• C11 standard (ISO/IEC 9899:2011):

• 7.21.10.1 The clearerr function (p: 338)

• C99 standard (ISO/IEC 9899:1999):

• 7.19.10.1 The clearerr function (p: 304)

• C89/C90 standard (ISO/IEC 9899:1990):

• 4.9.10.1 The clearerr function

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