#include #includevoid main(){float a,b,c,s,area;scanf("%f,%f,%f",&a,&b,&c);//这行c后面多写了个“，”s=1/2*(a+b+c);area=sqrt(s*(s-a)*(s-b)*(s-c));printf("a=%f,b=%f,c=%f,s=%f\n",a,b,c,s);printf("area=%f\n",area);}
