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Unions

Probably won't be used much, eh.

Like a structure, but all members share the same (starting) memory address

typedef union testUnion{
	int Int;
	float Real;
}

A union is the size of it's biggest member (in bytes)

A union will be one of these types, so either an int or float depending on what it's set as.

This can be useful for APIs, or if a variable could be a number of types. More likely the former.