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Question

A union consists of a number of elements that

A
all occupy the same space in memory
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B
must be structures
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C
are grouped next to each other memory
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D
all of the above
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Solution

The correct option is A all occupy the same space in memory

A union consists of a number of elements that all occupy the same space in memory.

A union is a value that may have any of several representations or formats within the same position in memory; or it is a data structure that consists of a variable that may hold such a value. Some programming languages support special data types, called union types, to describe such values and variables.

A union is a special data type available in C that allows storing different data types in the same memory location. We can't use more than one member at a time. We 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.


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