题解 | #计算三角形的周长和面积#

#include<stdio.h>
#include<math.h>
int main() {
    float a, b, c;
    scanf("%f %f %f", &a, &b, &c);
    float p;
    p = (a + b + c) / 2;      //计算半周长
    float area;
    area = sqrt(p * (p - a) * (p - b) * (p - c)); //计算面积
    printf("circumference=%.2f area=%.2f", p * 2, area);
    return 0;
}