题解 | 计算三角形的周长和面积

#include<stdio.h>
#include<math.h>
#define pi 3.1415926
int main() {
    int a, b, c;
    scanf("%d %d %d", &a, &b, &c);
    float circumference = a + b + c;
    //double x = pi/3;
    //float area = a*b*sin(x)/2;
    //海伦公式
    float d = circumference / 2.0;
    float area = sqrt(d * (d - a) * (d - b) * (d - c)); //sqrt开平方
    printf("circumference=%.2f area=%.2f", circumference, area);
    return 0;

}