fflush(FILE *stream) not working?

Question

while(1)
{
    ch=fgetc(ft);
    if(ch==EOF)
    {
        break;
    }
    if(ch=='u')
    {
        fputc('b',ft);
        fflush(ft);
    }
}

I tried to replace character after u with b in a file pointed by *ft.

This code runs fine but when I open the file it seemed to be unedited.

The above code works fine with fseeks(ft,0,SEEK_CUR).

Why it is not working with fflush(ft).

BTW your classmate already submitted the exact same question... — R.. GitHub STOP HELPING ICE, Feb 23 '14 at 10:40
@R.. : I got the problem...It is between fgetc() and fputc(). I have to put fseek() between them — kevin gomes, Feb 23 '14 at 10:41
What would "flushing" an input stream mean? Even if such an operation existed, it wouldn't eliminate the requirement to perform a successful seek between reading and writing. — R.. GitHub STOP HELPING ICE, Feb 23 '14 at 16:49

score 1 · Accepted Answer · answered Feb 23 '14 at 12:55

1

fflush only flushes output stream. Hence you need to put fseek(ft,0,SEEK_CUR) above your fputs(ft)

answered Feb 23 '14 at 12:55

zee

1 Answers1