coding OOP

#include
class hitung
{
private: float c;
float luas (int a, int b)
{
c=0.5*a*b;
return(c);
};
public: int A,B;
float C;
void input()
{
cout<<"input alas:";
cin>>A;
cout<<"input tinggi";
cin>>B;
C= luas(A,B);
cout<<"luas = "< };
};
void main()
{
hitung segitiga;
segitiga.input();
}