三角形面积计算公式

#include <iostream>
#include <cmath>
using namespace std;
int main () {
    double a, b, c, s, area;    //定义变量
    a = 3;    //对变量赋值
    b = 5;
    c = 7;
    s = (a + b + c) / 2;    //对a、b和c取值进行计算，计算结果赋值给s
    area = sqrt(s * (s - a) * (s - b) * (s - c));
    //对a、b、c和s取值进行计算，计算结果赋值给area
    cout << "Area = " << area << endl;    //对area取值用于输出
    return 0;
}