How Can I Properly Initialize a Const Data Member in C ?

Initialization of Const Data Members

In the provided code snippet, you attempt to initialize a const data member, t, within the class definition. However, the compiler returns an error. This error message indicates that, according to ISO C standards, initializing a const data member within the class is forbidden, and it must be initialized outside the class.

Const Variable Definition

A const variable represents a constant value that cannot be modified during program execution. To initialize a const data member, it must be declared within the class but defined outside it. The initializer list in the constructor provides a suitable way to initialize the const member.

Initializer List

The initializer list is a feature that allows the initialization of an object's data members before entering the constructor's body. The syntax for initializing a const member using the initializer list is as follows:

T1() : t(100) {}

In this example, T1() is the constructor, and : t(100) is the initializer list. Here, the assignment t = 100 occurs before the class initialization, ensuring that the const member is properly initialized.

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