Are unions useful in C?

Structs are marginally faster at runtime than classes , due to optimisations done by the compiler. You can enforce full immutability. If you declare a struct instance as let, you will not be able to change its properties.

Advantages of union It occupies less memory compared to structure . When you use union, only the last variable can be directly accessed. Union is used when you have to use the same memory location for two or more data members. It enables you to hold data of only one data member.8 Şub 2022

C unions are used to save memory . To better understand an union, think of it as a chunk of memory that is used to store variables of different types. When we want to assign a new value to a field, then the existing data is replaced with new data.