NSArray count error

hello,
have code:

code:

if ([variablefactors count] >= 1) {  		short j = 0;  		bool shouldrun = true;  		while (shouldrun) {  			if ([(rbmvariablefactor *)[variablefactors objectatindex:j] exponent] == 0) {  					//if factor empty remove  				[variablefactors removeobjectatindex:j];  			}else{  				j++;  			}  			shouldrun = (j <= ([variablefactors count] - 1));  		}  	}

when have variablefactors 1 object satisfies second if statement, gets removed before shouldrun line.
@ point check breakpoints j 0, variablefactors says '0 objects', set breakpoint after shouldrun reassigned , still true!!! while loops again , code crashes because i'm accessing empty array.
please help...

richard

 

i'm getting compile error on line ([(rbmvariablefactor....

last line 'shouldrun = ....' problem.

@ program:

code:

    nsmutablearray *variablefactors = [nsmutablearray arraywithobjects:@"foo", nil];                  nslog(@"count %lu", [variablefactors count]);         [variablefactors removeobjectatindex:0];                  nslog(@"count %lu after removing object @ index 0", [variablefactors count]);          nslog(@"count - 1 %lu", [variablefactors count] - 1);          

it outputs:

code:

mbhelp[1003:903] count 1 mbhelp[1003:903] count 0 after removing object @ index 0 mbhelp[1003:903] count - 1 18446744073709551615 

the 'count' method returns unsigned int - can't negative, expecting compare j to.

 

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