BLOCK STRUCTURE

BLOCK STRUCTURE:-

Ø  In ‘c’, variables can be defined in a block-structured fashion within a function.  Declaration of variables may follow the left brace that starts any compound statement.    

Ø  Variables declared inside a block are not affected by identically named variables in outer blocks.

Ø  An automatic variable is initialized every time when the block is entered whereas a static variable initialized only once at the time it enters the block.

Ex:-          int a=20;

  main()

{

      int a=10;

     {

         int a=30;

         printf("a=%d", a);

     }

  printf("a=%d",a);

  show();

  getch();

 }

show()

{

    printf("a=%d",a);

  {

     int a=50;

    printf("a=%d",a);

    }

}

Out put of above program is  a=30  , a=10,  a=20, a=50.