Function or Method with class in C++

Function with Class in C++:

• Already discussing about function, If you know details about function then click the below link.
• If you need to know about the class, then click the below link to learn detais of class in C++.
• Two different ways to defining the member functions.
• There are,
• Function definition inside the class
• Function definition outside the class

Function definition inside the class:

Syntax:

1. <header files>
   class class_name //class declaration
   {
             Access specifiers:
             Variable_declaration;
             Return_type Method_name( parameter list)
             {
             //Statements
             }
   };
   void main()
   {
   //object declaration
   Class_name object_name;
   //accessing member function using object
   object_name .function_name();
   }

Example:

1. #include<iostream.h>
   #include<conio.h>
   class calculate
   {
   int a,b;
   public:
   void get_data()//Function Definition inside the class
   {
   cout<<"\n Enter two values: ";
   cin>>a>>b;
   operation(a,b);
   }
   void operation(int x,int y) //Function Definition inside the class
   {
   cout<<"\n Additions of two value is: "<<x+y;
   cout<<"\n Subtractions of two value is: "<<x-y;
   cout<<"\n Muliplications of two value is: "<<x*y;
   cout<<"\n Divitions of two value is: "<<x/y;
   }
   };
   void main()
   {
   clrscr();
   calculate c;
   c.get_data();
   getch();
   }

Output:

Function definition outside the class:

• Declare the function in the class and it function is calling outside the class.
• If the method call in outside of the class by using scope resolution operator.
• It’s like double colon (::).

Syntax:

1. <header files>
   class class_name //class declaration
   {
             Access specifiers:
             Variable_declaration;
             Return_type Method_name( parameter list);
   };
   void main()
   {
   //object declaration
   Class_name object_name;
   //accessing member function using object
   object_name .function_name();
   }
   Return_type class_name :: Method_name( parameter list)
   {
             //Statement
   }

Example:

1. #include<iostream.h>
   #include<conio.h>
   class calculate
   {
   int a,b;
   public:
   void get_data();
   void operation(int x,int y);
   };
   void main()
   {
   clrscr();
   calculate c;
   c.get_data();
   getch();
   }
   void calculate :: get_data()//Function Definition outside the class
   {
   cout<<"\n Enter two values: ";
   cin>>a>>b;
   operation(a,b);
   }
   void calculate :: operation(int x,int y) //Function Definition outside the class
   {
   cout<<"\n Additions of two value is: "<<x+y;
   cout<<"\n Subtractions of two value is: "<<x-y;
   cout<<"\n Multiplications of two value is: "<<x*y;
   cout<<"\n Divisions of two value is: "<<x/y;
   }

Output:

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