Question

How to reset the error flags and the EOF indicator in C

Answer 1

#include <stdio.h>
#include <stdlib.h>
#include <assert.h>

int main(void)
{
    FILE* tmpfp = tmpfile();

    fputs("c-c++-c#-java\n", tmpfp);
    rewind(tmpfp);
    
    char ch;
    while ((ch = fgetc(tmpfp)) != EOF)
        printf("%c", ch);

    if (feof(tmpfp))
        puts("EOF set");
    else
        puts("EOF not set");

    clearerr(tmpfp); 

    if (feof(tmpfp))
        puts("EOF set");
    else
        puts("EOF not set");
}





/*
run:

c-c++-c#-java
EOF set
EOF not set

*/

 

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