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C Language > Learn C Language > What is the difference between a structure and a union...
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What is the difference between a structure and a union in C?

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Memory Allocation is the main difference between Structure and Union. Structure allocates memory for each of its members whereas Union won't do that.
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A structure is a user-defined data type available in C that allows to combining data items of different kinds. Structures are used to represent a record. Defining a structure: To define a structure, you must use the struct statement. The struct statement defines a new data type, with more than one member....
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A structure is a user-defined data type available in C that allows to combining data items of different kinds. Structures are used to represent a record. Defining a structure: To define a structure, you must use the struct statement. The struct statement defines a new data type, with more than one member. The format of the struct statement is as follows: struct [structure name] { member definition; member definition; ... member definition; }; A union is a special data type available in C that allows storing 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 purposes. Defining a Union: To define a union, you must use the union statement in the same way as you did while defining a structure. The union statement defines a new data type with more than one member for your program. The format of the union statement is as follows: union [union name] { member definition; member definition; ... member definition; }; read less
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