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From: jwp@uwmacc.UUCP
Newsgroups: comp.lang.c,comp.unix.questions
Subject: Question on large arrays in C
Message-ID: <1051@uwmacc.UUCP>
Date: Wed, 11-Feb-87 19:46:15 EST
Article-I.D.: uwmacc.1051
Posted: Wed Feb 11 19:46:15 1987
Date-Received: Thu, 12-Feb-87 20:29:59 EST
Organization: UWisconsin-Madison Academic Comp Center
Lines: 27
Keywords: C unix
Xref: watmath comp.lang.c:998 comp.unix.questions:1003

I am running 4.3BSD on a MicroVax II.
I have a simple program:

----------
#include <stdio.h>
#define N 20480
main()
{
	double x[N];
	double y_1[N];
	double y_2[N];
	double y_3[N];
	double y_4[N];
	char *l = "";

	fprintf(stdout, "hi\n");
	exit(0);
}
----------

When I run it, I get "Segmentation violation".
dbx reports the violation to occur on the "char *l" line.
If I move the 5 array declarations up above main(),
under the define statement, the program works OK.
What is wrong with the program as listed above?
-- 
	Jeff Percival ...!uwvax!uwmacc!sal70!jwp or ...!uwmacc!jwp