C Data Types Questions with Answers | C Programming MCQ | Page 3

C Data Types questions with answers help learners understand how data is stored, manipulated, and used in C programming. Data types form the foundation of C as they define the type of data a variable can hold, such as int, float, char, or double. Mastering C data types is essential for students preparing for placement exams or programming interviews at companies like TCS, Infosys, and Wipro. This topic often features in C programming MCQs and technical test questions that evaluate understanding of memory allocation, data precision, and type conversions. Practice these programming questions and answers to strengthen your core knowledge and prepare for real-world coding challenges.

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Q21

What is the size of "short int" typically?

A 1 byte
B 2 bytes
C 4 bytes
D 8 bytes

Answer: Option B

Explanation: short int is typically 2 bytes in size.

Q22

Which data type is used for storing large integers beyond int range?

A long
B long long
C big int
D huge int

Answer: Option B

Explanation: long long can store very large integers (typically 64-bit).

Q23

What does "volatile" keyword do?

A Prevents optimization
B Increases speed
C Reduces memory usage
D Makes variable constant

Answer: Option A

Explanation: volatile tells compiler that variable may change unexpectedly, preventing optimization.

Q24

Which is the correct declaration for a pointer to an integer?

A int ptr
B ptr int
C int *ptr
D *int ptr

Answer: Option C

Explanation: int *ptr is the correct syntax for declaring a pointer to an integer.

Q25

What is the range of "signed short int"?

A -128 to 127
B 0 to 255
C -32,768 to 32,767
D 0 to 65,535

Answer: Option C

Explanation: signed short int typically ranges from -32,768 to 32,767.

Q26

Which data type would be best for storing a person's weight?

A int
B float
C char
D double

Answer: Option B

Explanation: float is suitable for weight as it can have decimal values.

Q27

What is the purpose of "typedef" in C?

A Creates new data types
B Creates type aliases
C Defines constants
D Declares variables

Answer: Option B

Explanation: typedef is used to create aliases for existing data types.

Q28

Which of these is a floating-point data type?

A int
B char
C float
D long

Answer: Option C

Explanation: float is one of the floating-point data types in C.

Q29

What is the size of "long long int" typically?

A 4 bytes
B 8 bytes
C 16 bytes
D 2 bytes

Answer: Option B

Explanation: long long int is typically 8 bytes (64 bits) in size.

Q30

Which format specifier is used for "double"?

A %f
B %lf
C %d
D %Lf

Answer: Option B

Explanation: %lf is used for double in printf/scanf functions.

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