C# Datatypes Questions with Answers | Programming MCQ Practice | Page 3

The C# Datatypes questions with answers section is designed for programmers preparing for interviews and coding tests. These programming questions and answers focus on understanding how data types are defined, declared, and managed in C#. Top recruiters like TCS, Wipro, and Accenture often include datatype-based MCQs to assess logical and memory management skills. By exploring C# programming interview questions with answers, candidates can strengthen their foundational knowledge of variables, value types, reference types, and data conversions. This topic is ideal for learners seeking to master .NET concepts for competitive programming and job interviews.

Understand data types available in C programming. Also check C structures and C dynamic memory allocation

Showing 10 of 42 questions

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Q21

Which of the following is a reference data type?

A int
B double
C char
D string Explanation: String is a reference type in C#.

Answer: Option D

Explanation: String is a reference type in C#.

Q22

What is the size of int data type in C#?

A 2 bytes
B 4 bytes Explanation: An int occupies 4 bytes in C#.
C 8 bytes
D Depends on system

Answer: Option B

Explanation: An int occupies 4 bytes in C#.

Q23

Which data type can store decimal values with high precision?

A float
B double
C decimal Explanation: Decimal provides higher precision, mainly used in financial calculations.
D long

Answer: Option C

Explanation: Decimal provides higher precision, mainly used in financial calculations.

Q24

Which keyword is used to define a user-defined data type in C#?

A struct
B enum
C class
D All of the above Explanation: Struct, enum, and class all define user-defined data types.

Answer: Option D

Explanation: Struct, enum, and class all define user-defined data types.

Q25

What is the size of char data type in C#?

A 1 byte
B 2 bytes Explanation: Char stores Unicode characters and occupies 2 bytes.
C 4 bytes
D 8 bytes

Answer: Option B

Explanation: Char stores Unicode characters and occupies 2 bytes.

Q26

Which data type should be used to store a large whole number?

A int
B short
C long Explanation: Long is used for storing large integer values.
D byte

Answer: Option C

Explanation: Long is used for storing large integer values.

Q27

Which of the following is NOT a built-in data type in C#?

A float
B string
C object
D variant Explanation: Variant is not a data type in C#.

Answer: Option D

Explanation: Variant is not a data type in C#.

Q28

Which data type is the base type of all data types in C#?

A string
B object Explanation: Object is the base class for all types in C#.
C dynamic
D var

Answer: Option B

Explanation: Object is the base class for all types in C#.

Q29

Which keyword allows implicit type inference in C#?

A dynamic
B object
C var Explanation: var lets the compiler infer the type at compile time.
D auto

Answer: Option C

Explanation: var lets the compiler infer the type at compile time.

Q30

Which data type stores a single Unicode character?

A string
B char Explanation: Char represents a single Unicode character.
C byte
D bool

Answer: Option B

Explanation: Char represents a single Unicode character.

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