C Programming Language Union in C Language
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#include int main() { enum value{VAL1=0, VAL2, VAL3, VAL4, VAL5} var; printf("%d\n", sizeof(var)); return 0; }
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Union is an user defined datatype in C programming language. It is a collection of variables of different datatypes in the same memory location. We can define a union with many members, but at a given point of time only one member can contain a value. Unions can be very handy when you need to talk to peripherals through some memory mapped registers.