C Programming MCQ Questions with answers and solutions Page 147

Q. Which of the following can be used as a structure pointer?

(A) (*s).x
(B) s->x
(C) &s.x
(D) s.x

✅ Correct Answer: (B) s->x

Explanation: s->x is used to access members of a structure pointer.

Published by Mr. Dubey ⭐ 109.99K Points at 07-Jun-2025 09:25 am in C Programming

Q. What is the output?

Code:

int a = 5;
int *p = &a;
*p = 10;
printf("%d", a);

(A) 5
(B) 10
(C) 0
(D) Garbage

💬 Discuss

✅ Correct Answer: (B) 10

Explanation: Pointer dereferencing allows modifying the original variable.

Published by Mr. Dubey ⭐ 109.99K Points at 07-Jun-2025 09:25 am in C Programming

Q. What does 'fgetc()' return at EOF?

(A) '\0'
(B) NULL
(C) -1
(D) 0

💬 Discuss

✅ Correct Answer: (C) -1

Explanation: fgetc() returns EOF constant, usually -1, when the end of the file is reached.

Published by Mr. Dubey ⭐ 109.99K Points at 07-Jun-2025 09:25 am in C Programming

Q. Which of the following will compile successfully?

Code:

const int a;
a = 5;

(A) Yes
(B) No
(C) Only in C++
(D) Only for global vars

💬 Discuss

✅ Correct Answer: (B) No

Explanation: const means the variable cannot be modified once declared.

Published by Mr. Dubey ⭐ 109.99K Points at 07-Jun-2025 09:25 am in C Programming

Q. Which function moves the file pointer to a specified location?

(A) fseek()
(B) ftell()
(C) rewind()
(D) fmove()

💬 Discuss

✅ Correct Answer: (A) fseek()

Explanation: fseek() repositions the file pointer to a given location.

Published by Mr. Dubey ⭐ 109.99K Points at 07-Jun-2025 09:25 am in C Programming

Q. What does fclose() return on success?

(A) 1
(B) 0
(C) -1
(D) NULL

💬 Discuss

✅ Correct Answer: (B) 0

Explanation: fclose() returns 0 on successful file close.

Published by Mr. Dubey ⭐ 109.99K Points at 07-Jun-2025 09:25 am in C Programming

Q. What happens if you dereference a NULL pointer?

(A) Returns 0
(B) Segmentation fault
(C) Prints NULL
(D) Undefined result

💬 Discuss

✅ Correct Answer: (B) Segmentation fault

Explanation: Dereferencing NULL is illegal and causes a segmentation fault.

Published by Mr. Dubey ⭐ 109.99K Points at 07-Jun-2025 09:25 am in C Programming

Q. Which keyword is used to define macros?

(A) macro
(B) #define
(C) define
(D) #macro

💬 Discuss

✅ Correct Answer: (B) #define

Explanation: #define is used to create macro definitions in C.

Published by Mr. Dubey ⭐ 109.99K Points at 07-Jun-2025 09:25 am in C Programming

Q. What is a dangling pointer?

(A) Pointer to a variable
(B) Pointer to freed memory
(C) Pointer to null
(D) Pointer not initialized

💬 Discuss

✅ Correct Answer: (B) Pointer to freed memory

Explanation: Dangling pointers refer to memory that has been deallocated.

Published by Mr. Dubey ⭐ 109.99K Points at 07-Jun-2025 09:25 am in C Programming

Q. Which of the following is a correct way to define a struct?

(A) struct A { int x; }
(B) structure A { int x; }
(C) class A { int x; }
(D) define A { int x; }

💬 Discuss

✅ Correct Answer: (A) struct A { int x; }

Explanation: 'struct' is used to define structures in C.

Published by Mr. Dubey ⭐ 109.99K Points at 07-Jun-2025 09:25 am in C Programming

C Programming MCQs with answers Page - 147

Q. Which of the following can be used as a structure pointer?

Q. What is the output?

Q. What does 'fgetc()' return at EOF?

Q. Which of the following will compile successfully?

Q. Which function moves the file pointer to a specified location?

Q. What does fclose() return on success?

Q. What happens if you dereference a NULL pointer?

Q. Which keyword is used to define macros?

Q. What is a dangling pointer?

Q. Which of the following is a correct way to define a struct?

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