题解 A7858.计算三角形面积

2024/2/1 22:21

#include<bits/stdc++.h>
using namespace std;
double a,b,c;
double Heron_s_formula(double a,double b,double c){
	double p=(a+b+c)/2.0;
	return sqrt(p*(p-a)*(p-b)*(p-c));
}
int main(){
	cin>>a>>b>>c;
	printf("%.2f",Heron_s_formula(a,b,c));
	returnurn 0;
}