Union
The concept of the union is same like the structure the difference is of their storage method. All the data-members of the union are share same storage area. Union is very useful where we don’t want to assign the values to all the data members at same time.
e.g: union employee
{
int id;
char name[20];
float salary;
}emp;
And access of the union data-members is same like the structure.
e.g: emp.id;