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A pointer to a union can be cast to a pointer to each of its members (if a union has bit field members, the pointer to a union can be cast to the pointer to the bit field's underlying type). Likewise, a pointer to any member of a union can be cast to a pointer to the enclosing union.
At any time only one variable can be referred. Same syntax of structure is used to access a union member. The dot operator is for accessing members. The arrow operator ( ->) is used for accessing the members using pointer.
The structure and union members can be objects of any type, such as other structures, unions, or arrays. Both structures or unions can be passed by value to a function and returned to the value by functions. The argument will need to have the same type as the function parameter. To access members, we use the '.
In C++, we can create a pointer to a pointer that in turn may point to data or other pointer. The syntax simply requires the unary operator (*) for each level of indirection while declaring the pointer.
If no why? Uses of union over structure??
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