View Code of Problem 24

#include <stdio.h>
#include <math.h>
int main()
{
	float a, b, c, s;
	float x;
	scanf("%f %f %f", &a, &b, &c);
    x = (float)(a + b + c) / 2;
	s = sqrt(x * (x - a) * (x - b) * (x - c));
	printf("%.2f\n",s);
	return 0;
}