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How to use union in C program & whats the role of this?

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For memory efficient usage union is preferred. struct union uni {int a; char b;float c}; it will allocate 4 bytes on 32 bit system.
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Union is a data type in C it is just like structure but we use single variable at at time in union but this condition not mandatory for structure . Union save data storage as compared to structure. Union size is equal to max size of a variable used in union.
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Unions are much working like Structures. It is also user-defined data type. Unions were used in the early days when memory is at premium. Structure elements get independent memory locations where as union elements share same memory. Unions allowed to declare more than one element and allowed...
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Unions are much working like Structures. It is also user-defined data type. Unions were used in the early days when memory is at premium. Structure elements get independent memory locations where as union elements share same memory. Unions allowed to declare more than one element and allowed to work with only one element at at a time read less
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