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QuestionQuicksort algorithm is Causing stack overflow [modified] Pin
JKallen9-Aug-06 16:43
MemberJKallen9-Aug-06 16:43 
I do not understand why this is happening, however the following functions work for small numbers of data, but for larger numbers (ie 100,000 to 1,000,000) I get a stack overflow. These are protected functions of the class "Sample." Sample has a one dimensional dynamically allocated array of doubles pointed to by the m_data variable.

Any help would be appreciated because I have not been able to find a solution to this

Thanks

<br />
void Sample::quicksort(signed long int top, signed long int bottom){<br />
	signed int long middle;<br />
	if (top < bottom){<br />
		middle = partition(top, bottom);<br />
		quicksort(top, middle);<br />
		quicksort(middle+1, bottom);<br />
	}<br />
	return;<br />
}<br />
<br />
<br />
signed long int Sample::partition(signed long int top, signed long int bottom){<br />
	double x = *(m_data + top);<br />
	signed long int i = top - 1;<br />
	signed long int j = bottom + 1;<br />
	double temp;<br />
	do{<br />
		do{<br />
			j--;<br />
		}while (x > *(m_data+j));<br />
<br />
		do{<br />
			i++;<br />
		}while (x < *(m_data+i));<br />
		if (i < j){<br />
			temp = *(m_data+i);<br />
			*(m_data+i) = *(m_data+j);<br />
			*(m_data+j) = temp;<br />
		}<br />
	}while (i < j);     <br />
	return j;           // returns middle index <br />
}<br />

AnswerRe: Quicksort algorithm is Causing stack overflow Pin
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