Hi Arjun,
I want to give answer's of your question the difference between Structure and Union. As these two are the user-defined data types.
Difference Between Structure and Union
1. Keyword
The keyword ‘struct’ is used to define a structure whereas ‘union’ keyword is used to define a union.
2. Memory Allocation
Separate memory space is allotted for the members within a structure and members have different addresses that do not share memory. A union, on the other hand, shares the same memory space for all its members so shared memory location is allocated.
3. Member Access
A union stores a single value at a time for all its members making accessibility to only one member at a time. While multiple values can be stored in a structure so any member value can be accessed and retrieved at any time.
4. Size
The size of a structure is equal to the sum of the size of all members or more, whereas the size of a union is equal to the size of the largest size member.
5. Initialization
In a structure, several members can be initialized at once, while in a union, only the first member can be initialized with the value of its type.
5. Value
A structure can store different values of all the members and change in the value of one member will not have any effect on the values of other members. While a union stores same value for all its members and change of value of one member will affect the value of other.
Here is the coding example:
Structure:
struct Person
{
int height;
double weight;
}
Union:
union Person {
int height;
double weight;
}
To know more and the benefits of these user-defined data types, you can read out
this post
.
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