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C Programming - Declarations and Initializations - Discussion

Discussion Forum : Declarations and Initializations - General Questions (Q.No. 7)
Declarations and Initializations
7.
Which of the following is not user defined data type?
1 : 
struct book
{
    char name[10];
    float price;
    int pages;
};
2 : 
long int l = 2.35;
3 : 
enum day {Sun, Mon, Tue, Wed};
1
2
3
Both 1 and 2
Answer: Option
Explanation:

C data types classification are

  1. Primary data types
    1. int
    2. char
    3. float
    4. double
    5. void
  2. Secondary data types (or) User-defined data type
    1. Array
    2. Pointer
    3. Structure
    4. Union
    5. Enum

So, clearly long int l = 2.35; is not User-defined data type.
(i.e.long int l = 2.35; is the answer.)

Discussion:
48 comments Page 2 of 5.
Jjjay said:   1 decade ago
We can't write long int l = 2.35;
If you want to declare long int.

Write it like this:

long int l=2.35L
Arpit said:   1 decade ago
string is a user defined datatype because we can define string as char name[20] string is an array of character.
Harsha said:   1 decade ago
@Jjjay.

We can write long int as.

Long int i = 2.35.

It is syntactically correct in c lang.

The question is which one is not user defined data type, as long int, int are predefined in c language.
Kumar said:   1 decade ago
So basically only secondary data types are user defined? am I correct.
Bal said:   1 decade ago
Hey I think m little bit confused user defined data types are typedef n enum and derived data types are structure array etc.
Ragaveni said:   1 decade ago
@Kavitha.

User defined datatypes are defined by user as per user convenience and these are defined by making use of predefined datatypes.
Sivaraman said:   1 decade ago
How to identify user-defined data type? Give example.
Snehal said:   1 decade ago
As you said int and float are not user defined data types then why answer 1, 2 is wrong?
Varshitha said:   10 years ago
What is the difference between user defined and derived datatypes?

Can you tell me what is void data type?
Abhi said:   9 years ago
In 1, which is user-defined the data type.
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