View Code of Problem 24

#include <stdio.h>
#include <math.h>
#define p ((a+b+c)/2)
main(){
	double a,b,c,s;
	while(scanf("%lf %lf %lf",&a,&b,&c) != EOF){
		s = sqrt(p*(p-a)*(p-b)*(p-c));
		printf("%.2f\n",s);
	}
	return 0;
}

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