题解 | #计算三角形的周长和面积#

#include <stdio.h>
#include<math.h>
int main()
{
double a,b,c;
scanf("%lf %lf %lf",&a,&b,&c);
double cr= a+b+c;
double cr1 = cr/2;
double x0 =cr1*(cr1-a)*(cr1-b)*(cr1-c);
double x = sqrt(x0);
printf("circumference=%.2f area=%.2f",cr,x);
}