methods are defined outside the scope of the class

//methods are defined outside the scope of the class
#include<iostream.h>
#include<conio.h>

class sam
{
 private:
 float x;
 float y;

 public:
 void get();
 void disp();
 float sum();
 float diff();
 float mul();
 float div();
};   //End of the class

void sam::get()
{
 cout<<"Enter any two numbers"<<endl;
 cin>>x>>y;
}

void sam::disp()
{
 cout<<"First value="<<x<<endl;
 cout<<"Second value="<<y<<endl;
 cout<<"Sum="<<sum()<<endl;
 cout<<"Diff="<<diff()<<endl;
 cout<<"Mul="<<mul()<<endl;
 cout<<"Div="<<div()<<endl;
}

float sam::sum()
{
 return(x+y);
}

float sam::diff()
{
 return(x-y);
}

float sam::mul()
{
 return(x*y);
}

float sam::div()
{
 return(x/y);
}

void main()
{
 clrscr();
 sam temp;
 temp.get();
 temp.disp();
 temp.sum();
 temp.diff();
 temp.mul();
 temp.div();
 getch();
}