LOCAL AND GLOBAL VARIABLE IN C++

 VARIABLE SCOPE

A variable's scope is defined by where the variable is initialized or created.

or A scope of a variable is region in  the program where the existence of that variable is valid.

Based on Scope, Variables can be classified into two types.

LOCAL VARIABLE :  Local variable are declared inside the braces of any function and can be                                                                   assessed  only from there.//our program give it priority.

GLOBAL VARIABLE : Global variable are declared outside of any function and can be assessed from                                               anywhere.

DATA TYPE :  Data type define the type of data that a variable can hold.

tut3.c

//local and global variable in c++.

#include <iostream>

using namespace std;

   int main()

 {

 int a = 3 , c = 1 ;

 float b = 7.3 ;

 char charcter = 'M' ;

 double d = 3.7777 ;

 

 bool e  = true, f = false ;

 //cout << a << b << c << d;

cout<<"The value of a is :\n"<< a;

 

  cout<<"\nThe value of b is :\n"<<b;

cout<<"\nThe value of c is :\n" <<c ;

  cout<<"\nThe value of d is:\n"<< d ;

cout<<"\nThe value of charcter is :\n" << charcter;

  cout<<"\nThe value of e is:\n"<<e;

cout<<"\nThe value of f is:\n"<<f;

return 0;

}

//OUTPUT

The value of a is : 3 The value of b is : 7.3 The value of c is : 1 The value of d is: 3.7777 The value of charcter is : M The value of e is: 1 The value of f is: 0

tut3-1.c

//local and global variable in c++.

#include <iostream>

using namespace std;

 

int glo = 9; /* to yhn pe jo

                glo hai wo ak

globle variable hai..

or agar hm binna function ke

ander dusra koi glo variable

na banay or tb cout kre glo

ko tb ans 9 aayga */

 int main(){

 int glo = 77 ; /* ab hamne

                  main()

function ke ander glo ak

variable liya hai to Functions

ke ander jo bhi variable lete

hain wo local variable ban

jaata hai or ab agar hm cout

likhe to ans 77 aayga kunki

hamara program local variable

ko precedence deta hai.. */

 glo = 6 ; /* esa krne se

            variable update

hota hai or ab agar cout

krenge to ans 6 aayga..*/

 cout<<glo ;

return 0;

}

//OUTPUT

6

tut3-2.c

// local and global variable in c++.

#include <iostream>

using namespace std;

int glo = 9; /* it is Global

                Variable */

void sum()

{

  cout << glo;

}

int main()

{

  int glo = 77; /*it is local

                 Variable

becouse writen inside main()

Function So it has Presedense

 */

  glo = 6; /*we update our

            variable*/

  sum(); /* sum() is a

           function which

can execute by this type */

  cout << glo;

  return 0;

}

//OUTPUT

96