View Code of Problem 24

#include<iostream>
#include<vector>
#include<algorithm>
#include<iomanip>
#include<string>

using namespace std;

int main()
{
	double a, b, c;
	while (cin >> a >> b >> c) {

		double p = (a + b + c) / 2;

		double s = sqrt(p * (p - a) * (p - b) * (p - c));

		printf("%.2lf\n", s);
	}
}


/*
Main.cc: In function 'int main()':
Main.cc:16:14: error: 'sqrt' was not declared in this scope
   double s = sqrt(p * (p - a) * (p - b) * (p - c));
              ^~~~
Main.cc:16:14: note: suggested alternative: 'qsort'
   double s = sqrt(p * (p - a) * (p - b) * (p - c));
              ^~~~
              qsort
*/