C++ Programming Tutorial 44 - Unions

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C++ Programming Tutorial 44 - Unions

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[Sarcasticpigeon]

This is incorrect. Fundamentally incorrect. A union is like a struct, except that ALL of the variables occupy the memory of the largest member. This kind of means that they ALL exist at the same time.

You can easily verify this by printing the "HEX" value instead of the "decimal" value.

If you say "num.d = 6.7", and print as hex, you will get
And guess what? If you print num.i as hex, you will still get

This is convenient since both num.i and num.d contain 32 bits. If one of the members is larger (or smaller), you get stranger behavior....but the key thing to remember is that they ALL exist at the same time. If you initialize one member, ALL of the members get modified (because they all access the same memory).