Scope Resolution Operator

by CodezWordDecember 16, 20190 Comments
Scope Resolution Operator

  • C++ is block structured language.
  • Same variable name is used in different block for different tasks.
  • The scope of the variable is starts form declaration till the end of that block.
  • In other word  you can use  variable  in the block where we declare it.
  • Scope Resolution operator denotes with sign colon[:] 
Example:
................
................
block A
{
    .................
    int a=10;
    ................
}
.................
.................
block B
{
   .................
   .................
    int a=12;
   ................
   ................
}
..............
  • In this example there are 2 blocks .
  • And in both the block variable a is declared.
  • But the values are different in both the block.
  • If we print variable's value inside of the block A it will print 10.
  • Same as if we print the value inside the block B it will  print 12.
W.A.P. to find largest number from two numbers using of scope resolution operator. 
CODE:
#include<iostream>
using namespace std;
class set
{
int a,b;
public:
void input(void);
void display(void);
int largest(void);
};
int set :: largest(void)
{
if(a>=b)
return (a);
else
return(b);
}
void set :: input(void)
{
cout << "W.A.P. to find largest number from two numbers using of nesting member function.\n\n\n";
cout<<"Input values of a and b:" << "\n";
cin >> a >>b;
}
void set :: display(void)
{
cout<<"Largest value ="<< largest( ) << "\n";
}

int main( )
{
set A;
A.input( );
A.display( );
return 0;

}
OUTPUT:


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