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C++

union


Unions in C++ is a user defined data type that uses the same memory as other objects from a list of objects. At an instance it contains only a single object.

Syntax:
union union-type-name{
type member-name;
type member-name;
}union-variables;


Example:

#include  union Emp
{
int num;
double sal;
}; int main()
{
Emp value;
value.num = 2;
cout << "employee number::" << value.num
<< "\nsalary is:: " << value.sal << endl;
value.sal = 2000.0;
cout << "employee number::" << value.num
<< "\nsalary is:: " << value.sal << endl;
return 0;
}


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