source code c++ caculator

#include
#include
class calculator
{
private:
float a,s,d;
char z,x;
public:
void input ();
void proces ();
void output ();
};

void calculator::input ()
{
cout<<"Angka pertama = ";
cin>>a;
cout<<"Operasi perhitungan * / + - = ";
cin>>z;
cout<<"Angka kedua = ";
cin>>s;
}
void calculator::proces ()
{
if(z=='*')
{
d=a*s;
}
else if(z=='/')
{
d=a/s;
}
else if(z=='+')
{
d=a+s;
}
else if(z=='-')
{
d=a-s;
}
else
{
cout<<"Operasi perhitungan salah";
}
}

void calculator::output ()
{
cout<<"Operasi perhitungan * / + - = ";
cin>>x;
if(x=='=')
{
cout<<"Hasil perhitungan = "< }
else
{
cout<<"Program hanya dirancang untuk dua operasi perhitungan";
}
}

void main()
{
clrscr();
class calculator jalan;
jalan.input();
jalan.proces();
jalan.output();
getch();
}