A union is a user-defined type similar to structs in C except for one key difference . Structures allocate enough space to store all their members, whereas unions can only hold one member value at a time.
Read moreWhat are the uses of union?
The primary use of a union is allowing access to a common location by different data types , for example hardware input/output access, bitfield and word sharing, or type punning. Unions can also provide low-level polymorphism.
Read moreWhat is typedef union in C++?
Structures are used to group together different data elements (types of variables) under the same name . These data elements, known as members, can have different types and different lengths.
Read moreHow do C unions work?
A union is a special data type available in C that allows to store different data types in the same memory location . You can define a union with many members, but only one member can contain a value at any given time. Unions provide an efficient way of using the same memory location for multiple-purpose.
Read moreWhat is the meaning of typedef?
typedef is a reserved keyword in the programming languages C and C++ . It is used to create an additional name (alias) for another data type, but does not create a new type, except in the obscure case of a qualified typedef of an array type where the typedef qualifiers are transferred to the array element type.
Read moreWhat is the difference between union and struct in C++?
A union is like a struct in that it generally has several fields , all of which are public by default. Unlike a struct, however, only one of the fields is used at any given time. In other words, it is a structure that allows the same storage space to be used to store values of different data types at different times.
Read moreCan typedef be used in union?
The use of a typedef for a union type is very similar . typedef union Float Float; union Float { float f; char b[sizeof(float)]; }; A structure similar to this can be used to analyze the bytes that make up a float value.
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