题解 | #计算三角形的周长和面积#

#include <stdio.h>
#include<math.h>
//根据海伦公式 
int main()
{
	int len1, len2, len3;
	scanf("%d %d %d", &len1, &len2, &len3);
	float P = 0.0; //周长
	float S = 0.0;	//面积
	P = (len1 + len2 + len3);
    float D = P/2;
	//根据海伦公式
	S = sqrt(D*((D - len1)*(D - len2)*(D - len3)));
	printf("circumference=%.2f area=%.2f",P,S);
	return 0;
}