error C2448: '<Unknown>' : function-style initializer appears to be a functi

#include<iostream.h>
#include<math.h>
void main()
{
double a,b,c,p;
double s;
cout<<"请输入三边长:";
cin>>a>>b>>c;
qurd(a,b,c);
}

void squrd(a,b,c){
p=(a+b+c)/2;
double l=p*(p-a)*(p-b)*(p-c);
cout<<endl<<l;

};