C Union Syntax It is the system reserved keyword used to create and accessing its members . The UName is the name you want to give for this. For example, employees, persons, students. Data_Type means Data type of the variable that you want to declare. For example, int, float, char, etc.
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The first one is stored at the beginning of the struct, the second is stored after that, and so on . Unions only allocate enough space to store the largest field listed, and all fields are stored at the same space . Syntax for declaring a union is same as that of declaring a structure except the keyword struct.
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