Author: Robert Hyatt
Date: 20:41:55 04/10/03
Go up one level in this thread
On April 10, 2003 at 06:35:07, Uri Blass wrote:
>On April 09, 2003 at 23:56:54, Russell Reagan wrote:
>
>>So...who wants to explain how this works? I don't know how it works, but it
>>finds all of the solutions to the 8 queens problem.
>>
>>#include <stdio.h>
>>int v,i,j,k,l,s,a[99];
>>void main(void){
>>for(s=8;*a-s;v=a[j*=v]-a[i],k=i<s,j+=(v=j<s&&(!k&&!!printf(2+"\n\n%c"-(!l<<!j),"
>>#Q"[l^v?(l^j)&1:2])&&++l||a[i]<s&&v&&v-i+j&&v+i-j))&&!(l%=s),v||(i==j?a[i+=k]=0:++a[i])>=s*k&&++a[--i]);
>> printf("\n\n");
>>}
>
>I do not understand this code because my C knowledge is not enough.
>
>What is *a-s
>
>I understand that j*=v is j=j*v butI do not understand the meaning when * is at
>the beginning of the command.
>
>I never used it.
>
>Uri
a is a pointer. *a de-references the pointer and gets what a points at. Since
a is declared as an array, a itself is a pointer to the first element of the
array and *a is the same thing as saying a[0].
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.