View Code of Problem 24

#include <stdio.h>
#include <string.h>
#include <math.h>
#define N 100
int main()
{
	double a, b, c,p, s;
	while (~scanf("%lf %lf %lf", &a, &b, &c)) 
	{
		p = (a + b + c)/2;
		s = sqrt(p * (p - a) * (p - b) * (p - c));
		printf("%.2lf",s);
	}
	return 0;
	
}