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 cir,area;
    float s;
    cir = a + b+ c;
    s = (a + b + c)/2;
    if(a+b>c && a+c>b && b+c>a)
        area = sqrt(s*(s-a)*(s-b)*(s-c));
    printf("circumference=%.2f area=%.2f",cir,area);
    return 0;
}