A union contains different types of variables as its members and all these members share a memory location. In this article, we will learn how to declare and access the struct member inside a union in C++.

Structure Inside Union in C

To declare a structure inside a union we can use the below syntax:

Syntax to Declare Structure Inside Union in C

union unionName {
    struct structName structVar; // Struct as a member of the union
};

Here, structName is the name of the structure defined somewhere before the union declaration.

We can also declare the structure member directly inside the union as shown:

union unionName {
    struct structName {
           struct_member1;
           struct_member2;
    }structVar; // Struct as a member of the union
};

C Program to Declare Structure Inside Union

The below program demonstrates how we can declare a structure inside a union in C.

Number: 42
Character: A
Point: (10, 20)