~cpp
#include <iostream>
#include <math.h>
using namespace std;
void process(double a, double b, double c)
{
double s = (a+b+c)/2.0;
if(a == 0.0 && b ==0.0 && c==0.0)
cout << "The radius of the round table is: 0.000" << endl;
else
{
double temp = 2.0*sqrt(s*(s-a)*(s-b)*(s-c))/(a+b+c);
cout << "The radius of the round table is: " << temp << endl;
}
}
int main()
{
cout.setf(ios::fixed, ios::floatfield);
cout.setf(ios::showpoint);
cout.precision(3);
double a,b,c;
while(cin >> a >> b >> c)
{
process(a,b,c);
}
return 0;
}