Variable Declaration

This declaration of variables in the C language is permitted only in the starting of their block, prior to executable program statements. In C++ declaration of variables can be interspersed with executable program statements. The scope id variables, though, remains  the same - the block in which they are declared.

e.g.

void main()

                 {

                  int x = 10;

                printf (" the value of x= % d\n",x);

                int y = 0;

for( int z= 0; z < 10; ; z++)              // variable declared

here.

                       {

y ++;

x ++;

                                  }

}

Although, a deviation from the old style of declaring all variables in the starting of the block, this does save some amount of memory, i.e., a variable is not given a memory unless the declaration statement. Also, as a variable can be declared just before using it is assume to give a better control over variables.