Thread: sqrt function

Suppose I have this bit of code.

Code:

	side1=distance(x1, why1, x2, y2);
	side2=distance(x1, why1, x3, y3);
	side3=distance(x2, y2, x3, y3);
                tri_type(side1, side2, side3);

Code:

void tri_type(double first, double second, double third){
	//function to see if triangle is scalene, isosceles, or equilateral
	//parameters are the three side lengths of the triangle
	if((first==second)&&(second==third)) cout<<"The triangle is equilateral."<<endl;
	else if ((first!=second)&&(second!=third)&&(first!=third))
		cout<<"The triangle is scalene."<<endl;
			else cout<<"The triangle is isosceles."<<endl;
}

if the values for the three coordinates were. (0,0),(2,0) and (1, sqrt(3)) it should evaluate to an equalaterial triangle. Does the sqrt function do an approx.? or is the double not reading out to enough decimal places? Or other? In either case, how would I fix this?

Thanks
-Extol