#include <stdio.h>
#include <math.h>
void main()
{float a,b,c;
scanf("%f%f%f",&a,&b,&c);
float area(float ,float,float);---------------请问这个是什么意思?
printf("the area is %f",area(a,b,c));
}
float area(float a,float b,float c)------------这也又是什么意思?
{ float s,ss;
s=(a+b+c)/2;
ss=sqrt(s*(s-a)*(s-b)*(s-c));
return ss;
}