View Code of Problem 24

#include<stdio.h>
#include<string.h>
#include<math.h>
#define S(a,b,c) ((a + b + c) / 2)
#define AREA(a,b,c) sqrt(S(a,b,c)*(S(a,b,c)-a)*(S(a,b,c)-b)*(S(a,b,c)-c))
int main()
{
	float a,b,c,area;
	scanf("%f%f%f",&a,&b,&c);
	area = AREA(a,b,c);
	printf("%.2f",area);
	
}