题解 | #计算三角形的周长和面积#
计算三角形的周长和面积
https://www.nowcoder.com/practice/109a44d649a142d483314e8a57e2c710
#include<bits/stdc++.h>
using namespace std;
int main()
{
double a,b,c;
cin>>a>>b>>c;
double C=(a+b+c)/2;
double S=sqrt(C*(C-a)*(C-b)*(C-c));
cout<<"circumference="<<fixed<<setprecision(2)<<C*2<<" "<<"area="<<fixed<<setprecision(2)<<S<<endl;
}
