User Defined Types(C++ Programming ) Questions and Answers
Question 1.
How many types of models are available to create the user-defined data type?
1
2
3
4
Explanation:-
Answer: Option B. -> 2
There are two types of models. They are references to built-in types and multipart types.
Question 2.
What is the scope of typedef defined data types?
inside that block only
whole program
outside the program
none of the mentioned
Explanation:-
Answer: Option B. -> whole program
We are defining the user-defined data type to be availed only inside that program, if we want
to use anywhere means we have to define those types in the header file.
Question 3.
How many types of user-defined data type are in c++?
1
2
3
4
Explanation:-
Answer: Option C. -> 3
There are three types of user-defined data types. They are typedef, union, enumerator.
Question 4.
What is the syntax of user-defined data types?
typedef_existing data type_new name
typedef_new name_existing data type
def_existing data type_new name
none of the mentioned
Explanation:-
Answer: Option A. -> typedef_existing data type_new name
None.
Question 5.
What is the output of this program?
1. #include 2. using namespace std; 3. int main() 4. { 5. typedef int num; 6. typedef char let; 7. let w = "steve"; 8. num a = 10, b = 15; 9. num c = a + w; 10. cout
10steve
steve10
compile time error
compile but not run
Explanation:-
Answer: Option C. -> compile time error
error: invalid conversion from 'const char*' to 'let {aka char}'
Question 6.
What is the output of this program?
1. #include 2. using namespace std; 3. int main() 4. { 5. int i; 6. enum month { 7. JAN,FEB,MAR,APR,MAY,JUN,JUL,AUG,SEP,OCT,DEC 8. }; 9. for (i = JAN; i
012345678910
0123456789
01234567891011
none of the mentioned
Explanation:-
Answer: Option A. -> 012345678910
In this program, we are defined the data types as enumerator and printing its value in a order. Output: $ g++ user1.cpp $ a.out 012345678910
Question 7.
What is the output of this program?
1. #include 2. using namespace std; 3. int main() 4. { 5. typedef int num; 6. num a = 10, b = 15; 7. num c = a + b + a - b; 8. cout
20
15
30
25
Explanation:-
Answer: Option A. -> 20
In this program, we are manipulating the numbers and printing the result using user-defined
data types. Output: $ g++ user.cpp $ a.out 20
Question 8.
What does the data type defined by union will do?
It allow one different portion of memory to be accessed as same data types
It allow one same portion of memory to be accessed as same data types
It allow one different portion of memory to be accessed as different data types
It allow one same portion of memory to be accessed as different data types
Explanation:-
Answer: Option D. -> It allow one same portion of memory to be accessed as different data types
Union is used to define the data types of our choice and it will store the data type in one
location make them accessible.
Question 9.
Identify the correct statement.
typedef does not create different types.It only creates synonyms of existing types.
typedef create different types.
both a & b
none of the mentioned
Explanation:-
Answer: Option A. -> typedef does not create different types.It only creates synonyms of existing types.
By using typedef, we can create a type of pre-existing type only not our own type of data.
Question 10.
Which keyword is used to define the user defined data types?