题解 | #计算三角形的周长和面积#

#include<stdio.h>
#include<math.h>
int main()
{
	float a = 0.0; 
	float b = 0.0; 
	float c = 0.0; 
	scanf("%f%f%f", &a, &b, &c);  
	float cir = a + b + c;  
	float p = cir / 2;  
	float s = sqrt(p * (p - a) * (p - b) * (p - c));  
	printf("circumference=%.2f area=%.2f", cir, s);  
	return 0; 
}