Master C Programming with These Expert C MCQ Questions & Answers

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Enhance your C programming expertise with these carefully curated C MCQs. Designed for beginners and advanced learners, these multiple-choice questions cover fundamental to complex topics. Strengthen your concepts, improve problem-solving skills, and prepare for coding interviews or exams with confidence. Practice now and become proficient in C programming!

Improve your C programming skills with these carefully selected multiple-choice questions (MCQs). Whether you're a beginner or an advanced coder, these questions cover fundamental to complex topics. Each question comes with an answer to help you learn and reinforce your understanding of C.

Basic C MCQ Questions and Answers

What is the correct syntax to declare a variable in C?
A) var x;
B) int x;
C) x int;
D) variable x;
Answer: B) int x;

Which data type is used to store a single character in C?
A) int
B) char
C) string
D) float
Answer: B) char

What will be the output of printf("%d", 5/2); in C?
A) 2.5
B) 2
C) 2.0
D) 5/2
Answer: B) 2

Which of the following is used to take input in C?
A) printf()
B) scanf()
C) read()
D) input()
Answer: B) scanf()

Which operator is used for logical AND in C?
A) &&
B) &
C) ||
D) |
Answer: A) &&

Intermediate C MCQ Questions and Answers

Which loop is guaranteed to execute at least once?
A) for loop
B) while loop
C) do-while loop
D) None of the above
Answer: C) do-while loop

What is the correct way to define a constant in C?
A) constant int x = 10;
B) int const x = 10;
C) #define x 10
D) Both B and C
Answer: D) Both B and C

What does sizeof(int) return in a typical 32-bit system?
A) 2
B) 4
C) 8
D) Depends on the system
Answer: B) 4

Which function is used to dynamically allocate memory in C?
A) malloc()
B) alloc()
C) memory()
D) new()
Answer: A) malloc()

What will strlen("Hello") return?
A) 4
B) 5
C) 6
D) Undefined
Answer: B) 5

Advanced C MCQ Questions and Answers

Which header file should be included for strcmp() function?
A) stdlib.h
B) conio.h
C) string.h
D) strings.h
Answer: C) string.h

What is a pointer in C?
A) A keyword
B) A variable that stores the address of another variable
C) A function
D) A special type of loop
Answer: B) A variable that stores the address of another variable

What is the output of printf("%d", sizeof(NULL)); in C?
A) 2
B) 4
C) 8
D) Compiler-dependent
Answer: D) Compiler-dependent

Which keyword is used to exit a loop?
A) stop
B) exit
C) break
D) end
Answer: C) break

How can you declare an array of 10 integers in C?
A) int arr(10);
B) int arr[10];
C) array arr[10];
D) declare arr[10];
Answer: B) int arr[10];

Which of the following correctly declares a pointer?
A) int *ptr;
B) ptr int;
C) pointer int ptr;
D) int ptr;
Answer: A) int *ptr;

What is the function of free() in C?
A) Allocates memory dynamically
B) Releases previously allocated memory
C) Prints memory status
D) None of the above
Answer: B) Releases previously allocated memory

Which of the following is NOT a valid C storage class?
A) auto
B) static
C) mutable
D) extern
Answer: C) mutable

What is a structure in C?
A) A function type
B) A user-defined data type that groups different data types
C) A loop type
D) None of the above
Answer: B) A user-defined data type that groups different data types

Which operator is used to access structure members?
A) . (dot)
B) -> (arrow)
C) * (asterisk)
D) Both A and B
Answer: D) Both A and B

What is the output of printf("%c", 'A' + 2);?
A) A
B) B
C) C
D) Error
Answer: C) C

How do you open a file in write mode in C?
A) fopen("file.txt", "r");
B) fopen("file.txt", "w");
C) open("file.txt", "write");
D) file("file.txt", "w");
Answer: B) fopen("file.txt", "w");

Which function is used to read a string in C?
A) scanf()
B) gets()
C) fgets()
D) Both B and C
Answer: D) Both B and C

What does feof(fp) do in C?
A) Checks if a file exists
B) Returns true if the end of a file is reached
C) Deletes a file
D) Closes a file
Answer: B) Returns true if the end of a file is reached

Which of the following is NOT a standard C library function?
A) printf()
B) clrscr()
C) strcpy()
D) fopen()
Answer: B) clrscr()

What is the return type of the main() function in C?
A) int
B) void
C) main
D) None of the above
Answer: A) int

What happens if you access an array out of its bound in C?
A) Compiler error
B) Runtime error
C) Undefined behavior
D) Memory allocation error
Answer: C) Undefined behavior

Which function is used to copy strings in C?
A) strcpy()
B) strcat()
C) copy()
D) strcopy()
Answer: A) strcpy()

Which keyword is used to prevent modification of a variable in C?
A) final
B) constant
C) const
D) static
Answer: C) const

Which of the following is NOT a valid loop in C?
A) for
B) while
C) repeat
D) do-while
Answer: C) repeat

What does void mean in function declaration?
A) Function does not return a value
B) Function takes no arguments
C) Function returns an integer
D) Function returns a pointer
Answer: A) Function does not return a value

Which function is used to compare two strings in C?
A) strcmp()
B) strcomp()
C) equals()
D) cmpstr()
Answer: A) strcmp()

Which of the following is NOT a valid data type in C?
A) int
B) float
C) string
D) double
Answer: C) string

What is the main purpose of typedef in C?
A) Create new variables
B) Define new data types
C) Allocate memory dynamically
D) None of the above
Answer: B) Define new data types

These C MCQ questions help in mastering the language by covering important topics like loops, functions, arrays, and memory management. Keep practicing to improve your problem-solving skills in C programming!

Best Indian Books for C MCQ with Author Name and Publication

1. "Test Your C Skills" – Yashavant Kanetkar (BPB Publications)
This book is a must-read for C programmers, offering tricky multiple-choice questions that test logical and analytical thinking. The MCQs cover syntax, pointers, loops, functions, and memory management.

2. "C Programming FAQs: Frequently Asked Questions" – Sumitabha Das (McGraw Hill Education)
Includes conceptual MCQs focusing on C fundamentals, problem-solving techniques, and practical coding scenarios, making it ideal for students preparing for exams and interviews.

3. "The C Question Bank" – Suresh Kumar Srivastava (BPB Publications)
A vast collection of MCQs covering data types, operators, control structures, functions, arrays, pointers, and file handling with detailed explanations.

4. "Objective C Programming" – Ashok Kamthane (Pearson Education)
Designed for beginners and intermediate learners, this book offers MCQs covering every topic, from basic syntax to advanced concepts like dynamic memory allocation and linked lists.

5. "Programming in ANSI C" – E. Balagurusamy (McGraw Hill Education)
Contains well-structured MCQs on fundamental and advanced topics, including control statements, recursion, file handling, and data structures in C.

6. "C Programming and Data Structures" – Kogent Learning Solutions (Dreamtech Press)
Features objective-type questions covering both C programming basics and data structures like stacks, queues, trees, and graphs.

7. "C Programming: A Problem-Solving Approach" – Forouzan & Gilberg (Cengage Learning)
Offers logically arranged MCQs on problem-solving techniques using C, covering fundamental and practical coding challenges.

8. "C in Depth" – Deepali Srivastava & S. K. Srivastava (BPB Publications)
Includes challenging MCQs with explanations focusing on arrays, strings, functions, and pointers, useful for competitive exams and interviews.

9. "Let Us C – WorkBook" – Yashavant Kanetkar (BPB Publications)
Contains hands-on practice MCQs that reinforce C programming concepts with real-world examples and practical implementation.

10. "C Programming & Data Structures" – Jitender Singh & Rakesh Sehgal (Katson Books)
Covers MCQs with varying difficulty levels, focusing on theoretical and applied C programming concepts.

11. "Mastering C Programming" – Venugopal & Prasad (McGraw Hill Education)
Provides well-structured multiple-choice questions, including tricky logical MCQs, case studies, and real-world programming scenarios.

12. "C Programming: Test Your Skills" – Shivani Goel (Kogent Learning Solutions)
Includes MCQs covering core and advanced topics such as recursion, memory management, and structure handling in C.

13. "Cracking the C Programming Interview" – Subhash K. U (Technical Publications)
Offers MCQs designed specifically for competitive exams and job interviews, including company-specific coding problems.

14. "C Programming & Problem Solving" – J. D. Lee & R. R. Ziegler (Vikas Publishing House)
Features objective-type questions focused on problem-solving techniques, covering basic and advanced programming concepts.

15. "Data Structures and C Programming" – Ajay Mittal (Pearson Education)
Includes MCQs that combine C programming with data structures, covering linked lists, trees, searching, and sorting techniques.

16. "C Programming Simplified" – Vikas Gupta (Dreamtech Press)
Presents simplified explanations with a vast collection of multiple-choice questions that help students grasp C programming concepts effortlessly.

17. "C Programming for Beginners" – Kunal Ghosh (BPB Publications)
Offers step-by-step explanations along with MCQs designed for beginner-level programmers, covering syntax, loops, and functions.

18. "Fundamentals of C Programming" – Ram Kumar & Rakesh Agarwal (S. Chand Publishing)
Features MCQs covering basic and intermediate concepts, making it useful for students and coding aspirants.

19. "C Programming: The Ultimate MCQ Guide" – Rajesh Kumar (Tech Knowledge Publications)
Provides topic-wise MCQs covering the entire C programming syllabus, useful for both academic and competitive exams.

20. "Advanced C Programming MCQs" – Praveen Kumar (Techtonics Books)
Offers complex MCQs focusing on pointers, dynamic memory management, bitwise operations, and optimization techniques in C programming.

C programming is one of the most fundamental and widely used languages in computer science. Multiple-choice questions (MCQs) play a significant role in testing and reinforcing programming concepts. They help learners grasp key topics effectively, from syntax basics to advanced problem-solving techniques.

MCQs in C programming cover a broad spectrum of topics, starting with variable declarations, data types, and operators. Understanding how C handles different data types, memory allocation, and expressions is crucial for efficient coding. Many questions focus on integer and floating-point operations, implicit type conversion, and precedence of operators.

Control flow and loops form another vital category. C MCQs often test knowledge of for, while, and do-while loops, along with conditional statements like if-else and switch-case. These questions help learners identify logical flow and common errors in iterative and decision-making constructs.

Functions in C are a frequently tested topic, covering function declarations, recursion, return types, and parameter passing techniques. Pointers and memory management are among the most challenging areas in C, making them a common focus of MCQs. Questions often assess pointer arithmetic, dynamic memory allocation using malloc and calloc, and pointer-to-pointer concepts.

Arrays and strings also appear frequently in C MCQs. Learners must understand how arrays are stored in memory, how they interact with pointers, and how string manipulation functions like strlen, strcpy, and strcmp work. Multi-dimensional arrays and their applications in matrix operations are common areas for objective-type questions.

File handling is another crucial topic. MCQs in this area cover file operations using fopen, fclose, fprintf, and fscanf. Many questions test the ability to read and write data using file pointers and handle errors in file handling operations.

The concept of structures and unions is frequently examined in C programming MCQs. Questions test how these user-defined data types work, their memory consumption, and their role in organizing complex data structures. Some advanced questions explore nested structures, bit fields, and typedef usage.

Many C MCQs focus on debugging and error detection. These questions present snippets of incorrect code, requiring learners to identify syntax errors, logical errors, or undefined behavior. They sharpen problem-solving skills by highlighting common mistakes in programming.

For those preparing for competitive exams or job interviews, MCQs on C programming logic and algorithms are particularly important. These cover searching and sorting algorithms, bitwise operations, and performance optimization techniques. Understanding how to implement and optimize algorithms using C can give candidates an edge in technical assessments.

Practicing C MCQs helps build a strong foundation and confidence in programming. By solving a variety of questions covering different aspects of C, learners can enhance their coding efficiency, identify weak areas, and improve their problem-solving approach.

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