Path: utzoo!utgpu!news-server.csri.toronto.edu!clyde.concordia.ca!uunet!zephyr.ens.tek.com!tektronix!nosun!qiclab!m2xenix!puddle!p0.f4.n494.z5.fidonet.org!cspw.rures
From: cspw.rures@p0.f4.n494.z5.fidonet.org (cspw rures)
Newsgroups: comp.lang.c
Subject: ungetc/scanf independent?
Message-ID: <3009.260C8D7C@puddle.fidonet.org>
Date: 25 Mar 90 18:03:46 GMT
Sender: ufgate@puddle.fidonet.org (newsout1.26)
Organization: FidoNet node 5:494/4.0 - Settler City Fido, Grahamstown RSA
Lines: 32


 
I have a VAX problem when interleaving calls to getc and ungetc with
calls to scanf.   On all the compilers I tested (except the VAX VMS 4.2),
and "ungetc" character is available to a subsequent scanf.  On the VAX
it appears that getc and ungetc have their own private "view" of the file,
not shared by scanf.
 
Is the VAX C compiler broken?   What does ANSI say?
 
     #include <stdio.h>
 
     int main(void)
     {  char c; int i;
        c = getc(stdin);
        ungetc(c,stdin);
        scanf("%d",&i);
        printf("%d\n",i);
     }
 
For test data like
123
the VAX prints 23.
 
Thanks
Pete Wentworth



--  
uucp: uunet!m2xenix!puddle!5!494!4.0!cspw.rures
Internet: cspw.rures@p0.f4.n494.z5.fidonet.org