Unions in C++
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1) Define a C++ union. Explain how a union may be used.
2) How may sharing be associated with unions?
3) What are the alternatives to unions?
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1) Define a union. Explain how a union may be used.
Briefly we can define union as a user defined data type that can be used to manipulate same memory space as different data type entities. In other words, union is a user defined data type that allows same portion of memory to be accessed as different data types, as all of the union members share same location in memory.
Consider a union of an int, a float and a char array of size 4 units.
union cfi {
char ca[4];
float f;
int i;
} var;
We can access different members of this union as shown ...
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