Union in C programming | Structure vs Union

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.

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[anjalimeena]

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[poojapoojadhapte]

Thankyou because of u all topic clear dont stop doing urs all subjects are beautiful

[divyanshjain]

one of the best video explaining union briefly...thank you sir

[rupesh_gamer]

thanks sir for everything
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[gajananandurkar]

Thanks sir your teaching method is very easy

[rohitthakur]

If we have to use only the largest memory's variable, then why we are declaring the other variables, with small data types in Union? We can declare just one variable with maximum data type.

[Harshit_patel]

bahut accha padhate ho sab samaj aa gya thank you

[pandayalachandrashekar]

Tq Bro
Because of you I got good marks in RDBMS 🙂🙂🙂

[TheMR-]

Well, you said that, to store a distance of “High Variability”, we use Union. But, in reality, you can simply use a double, for Decimal as well as Integer values, or unsigned double if you want more storage. That's not a problem, and that's not actually where it's used.
Union is strongly related to type punning (type-casting). If you want to read a variable of Type: A, as Type: B, (without copying) we can use either of following methods:
- *(B*)(&A)
- or, by using a union

Union is most commonly used in Polymorphism. Where, an Object can act as a Base (primitive) Object, or a Derived (primitive) Object. Like, reading integer as double, or reading float as long etc.
Edit: Corrected Wording

[vinushisoni]

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But best explanation thank you Sir👌

[rajanmodanwal]

Sir Data structure & Algorithms Start
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[dikshakumari]

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[hirenmeghnani]

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[souvikmajumdar]

Instead of writing g so many variable in union why can't we just take "double data type" to define the size? What is the reason behind taking all the data type and the size of the biggest data type get's the priority!?

[mr.rameshbhaiapatelfitter]

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[nidhisharma]

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[__Uv]

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[jyotiyadav]

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