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Constants and Constant Arrays

Constants allow you to calculate the value of an expression and store it. Compare constants with preprocessor constants. Preprocessor is run before compilation of source file occurs and therefore has limited expression evaluation capabilities.

Syntax:

const name-id = value-expr;

Constants are allowed in any scope. A value-expr must be constant:

const MyConstant = 5;  // valid, constant expression

struct A
{
    int a;
    const double_a = a * 2;    // error, value-expr is not a constant
};

Constant Arrays

You can use the following syntax to declare an array:

const name-id [ ] = { initializer-list };

Where name-id is a name of array and initialize-list is a comma-separated list of expressions that initialize array elements.