Xref: utzoo comp.lang.c:40066 comp.lang.c++:14089
Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!wuarchive!psuvax1!psuvm!prd3
Organization: Penn State University
Date: Friday, 14 Jun 1991 09:53:27 EDT
From: <PRD3@psuvm.psu.edu>
Message-ID: <91165.095327PRD3@psuvm.psu.edu>
Newsgroups: comp.lang.c,comp.lang.c++
Subject:    array side-effect

I have found a real stumper.
Partial listing follows:
...
int CODE_MATRIX[26][25];         //global
char INMOD1[50][3];              //global
...
int mod_loop=0;                  //local
...
mod_loop++;
INMOD1[mod_loop][0]="9";        //mod_loop is 1


This last statement changes the value of CODE_MATRIX[26][1]
from -9 to some large random number. Rows 1-25 are unchanged.
CODE_MATRIX[26][0] and CODE_MATRIX[26][2] may also be affected
but I forgot to check.  I have tried '9' instead of "9"
and I have used strcpy to replace the whole line.  The problem persists.

I am using Borland Turbo C++ on a 386Clone running DOS.