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;
}