Constants in C Language Questions with Answers | Page 2

Constants are one of the most fundamental topics in C programming. This set of constants in C language questions with answers covers the use and declaration of constants, symbolic names, and constant data types. For students preparing for GATE, Infosys, or Tech Mahindra placement exams, understanding constants helps you write more reliable and readable code. These C programming MCQs are designed to strengthen your basics in data storage, syntax, and memory management. Each question includes clear explanations to help you differentiate between literals, symbolic constants, and macros effectively.

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Q11

Which of the following is a valid way to define a constant in C?

A const int x = 5;
B constant int x = 5;
C int const x = 5;
D Both 1 and 3

Answer: Option D

Explanation: const keyword is used to define constants in C

Q12

What is the correct way to define a symbolic constant in C?

A #define MAX 100
B const MAX = 100;
C constant MAX 100
D def MAX 100

Answer: Option A

Explanation: #define preprocessor directive is used for symbolic constants

Q13

Which keyword is used to define constants in C?

A constant
B fixed
C const
D final

Answer: Option C

Explanation: const keyword is used for defining constants

Q14

What will be the output of: #define PI 3.14 printf("%f", PI);

A 3.14
B 0
C PI
D Error

Answer: Option A

Explanation: PI will be replaced by 3.14 during preprocessing

Q15

Which of the following is NOT a valid constant definition?

A const int x = 10;
B #define Y 20
C const float z;
D int const w = 30;

Answer: Option C

Explanation: Missing semicolon makes this invalid

Q16

What is the value of a const variable that is not initialized?

A 0
B Garbage value
C Compiler error
D NULL

Answer: Option C

Explanation: const variables must be initialized at declaration

Q17

Which of the following is a string constant?

A "Hello"
B 'A'
C 100
D 3.14

Answer: Option A

Explanation: Double quotes define string constants

Q18

What is the type of constant 100?

A int
B long
C char
D float

Answer: Option A

Explanation: Default type for integer constants is int

Q19

How to define a constant pointer in C?

A int const *ptr;
B const int *ptr;
C int *const ptr;
D const *int ptr;

Answer: Option C

Explanation: const before * makes pointer constant

Q20

Which of these is a character constant?

A 'A'
B "A"
C A
D 65

Answer: Option A

Explanation: Single quotes define character constants

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