If we use const variable instead of #define, we can specify the scope of the variable.

1)CONST is a keyword in c++.
2)If a variable is declared as const the value of the variable will not change through out the program.
3)example:
void main()
{
clrscr();
const a=40;
for(int i=0;i<=100;i++)
a++;
cout<<a;//a=40;
}
in the above program the output will be 40.

By declaring a data type as const it can never be modified at any point in the program.

i.e

const int n=10;
cin>>n;

This throw an error.

Declaring a const variable instead of using #define allows you to specify a data type for the constant. The const modifier itself prevents the variable from being accidentally modified in an expression and gives the compiler the opportunity to substitute the assigned value as an optimization.

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