Class with scope resolution in c++

Scope resolution operator in c++:

How to give function definition at out of the class in c++?

How to use scope resolution operator in c++ using class?

• The scope resolution operator is used to access data members and member function at the out of the classes.
• It mainly used to return value at the class.
• This operator symbol is::( double colon).

Syntax:

1. class class_name

   {

   Access_specifier:

   return type function_declaration(parameter_list);

   };

    

   //function definition

   return_type class_name :: fuction_name(parameter_list)

   {

             //function body

   }

    

   void main()

   {

             function_calling(parameter_list);

   }

Example program:

1. #include<iostream.h>

   #include<conio.h>

   #include<iomanip.h>

   class std

   {

   public:

   //function declaration

   int total(int,int,int,int,int);

   float average(int);

   void display(int ,char [], int ,int ,int ,int ,int ,int ,float );

   };

    

   int std :: total(int m1,int m2, int m3,int m4,int m5)

   {

   int tot;

   tot = m1+m2+m3+m4+m5;

   return tot;

   }

    

   float std :: average(int tot)

   {

   float avg;

   avg =tot/5;

   return avg;

   }

    

   void std ::  display(int sno,char *name, int m1,int m2,int m3,int m4,int m5,int tot,float avg)

   {

   cout<<"\n Student details............";

   cout<<"\n Student id is : "<<sno;

   cout<<"\n Student name is : "<<name;

   cout<<"\n Five subject marks : "<<m1<<setw(5)<<m2<<setw(5)<<m3<<setw(5)<<m4<<setw(5)<<m5;

   cout<<"\n Total mark for five subject :"<<tot;

   cout<<"\n Average mark for five subject :"<<avg;

   }

    

   void main()

   {

   int sno,m1,m2,m3,m4,m5,tot;

   float avg;

   char name[30];

   clrscr();

   cout<<"\n Enter student number : ";

   cin>>sno;

   cout<<"\n Enter student name : ";

   cin>>name;

   cout<<"\n Enter Five subject mark : ";

   cin>>m1>>m2>>m3>>m4>>m5;

   std s;//object declaration

   tot=s.total(m1,m2,m3,m4,m5);

   avg=s.average(tot);

   s.display(sno,name,m1,m2,m3,m4,m5,tot,avg);

   getch();

   }

Output:

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