题解 | #计算三角形的周长和面积#

#include <stdio.h>

int main()
{
    double a, b, c;
    scanf("%lf %lf %lf", &a, &b, &c);
    
    double p = (a + b + c) / 2;
    
    //海伦公式求三角买面积S=√[p(p-a)(p-b)(p-c)]
    
    printf("circumference=%.2lf area=%.2lf", (a + b + c), sqrt(p * (p - a) * (p - b) * (p - c)));
    
    return 0;
}