View Code of Problem 24

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