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Zmurf

Why isn't my Distance to Point scirpt working?

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I am using the following code to calculate the distance between two 2d coordinates.
double PointDist(double x1, double y1, double x2, double y2){
	double rise, run, length;
	rise = y2 - y1;
	run = x2 - x1;
	length = sqrt(pow(rise, 2) + pow(run, 2));

	return length;
}

The number I always get is 0.6000000x, where x is where the variation actually starts in the number thats returned. Heres a couple of numbers i got back. 0.60000002318111012 0.60000002075052783 Can anyone see the problem?

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