Abstand zweier Punkte

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#include <iostream>
#include <math.h>
using namespace std;


float laenge(int x1, int y1, int x2, int y2) {
	int distx;
	int disty;
	if (x1>=x2)  distx= x1-x2;
	else  distx= x2-x1;
	if (y1>=y2)  disty= y1-y2;
	else  disty= y2-y1;
	return (sqrt((float) (distx*distx)+(float) (disty*disty)));
}


float test_laenge ( int x1, int y1, int x2, int y2) {
	cout << "X_1 = " << x1 << "   Y_1 = " << y1 << "\n";
	cout << "X_2 = " << x2 << "   Y_2 = " << y2 << "\n";
	cout << "Laenge: " << laenge(x1,y1,x2,y2) << "\n\n";
	return 0;
}


int main () {
	test_laenge (0,0,12,5);
	test_laenge (-12,-2,-1,0);
	test_laenge (-4,3,8,8);
	test_laenge (8,11,-7,-10);
	test_laenge (8,11,8,11);
	return 0;
}