Const type qualifier
const int SIZE = expression;
There are no changes after initialization
When is const preferred over enum or macro? - Its value is decided at run time. - It is used where its address (& operator) is required. - It must be recognized by the compiler/ debugger. - In trying to force a function not to modify an array argument, or any argument that is passed by its address.
Example: int foo(const int arr[],int exp) { …. Arr[j] = exp; /* The compiler may shout here !*/ }