C Programming

What does the sizeof() operator do in C? a) It returns the size of a variable or data type in bytes b) It allocates memory c) It deallocates memory d) It returns the address of a variable Answer: a) It returns the size of a variable or data type in bytes Explanation: The sizeof() operator […]

What is the difference between malloc() and calloc() in C? a) calloc() initializes the allocated memory to zero, malloc() does not b) malloc() initializes the allocated memory to zero, calloc() does not c) malloc() and calloc() allocate memory on different memory segments d) calloc() can allocate memory for more than one data type, malloc() cannot

What does the free() function do in C? a) It deallocates previously allocated memory b) It allocates memory dynamically c) It sets a pointer to null d) It prints a value to the console Answer: a) It deallocates previously allocated memory Explanation: The free() function in C is used to deallocate memory that was previously

What is the purpose of malloc() in C? a) To dynamically allocate memory b) To deallocate memory c) To allocate memory on the stack d) To initialize variables Answer: a) To dynamically allocate memory Explanation: The malloc() function in C is used to dynamically allocate memory at runtime. It allocates a specified number of bytes

What is a null pointer in C? a) A pointer that does not point to any memory location b) A pointer that points to a random memory location c) A pointer that points to the first memory location d) A pointer that stores the value of zero Answer: a) A pointer that does not point

What does the & operator do in C? a) It returns the memory address of a variable b) It performs a bitwise AND operation c) It dereferences a pointer d) It performs a logical AND operation Answer: a) It returns the memory address of a variable Explanation: The & operator in C, when used with

What is the purpose of the * operator in C when used with pointers? a) It dereferences a pointer to access the value at the memory address b) It declares a pointer variable c) It performs multiplication d) It adds two pointers together Answer: a) It dereferences a pointer to access the value at the

What is a pointer in C? a) A variable that stores the memory address of another variable b) A variable that stores a value c) A data type for storing integers d) A function that allocates memory Answer: a) A variable that stores the memory address of another variable Explanation: A pointer in C is

What does the printf() function do in C? a) It prints formatted output to the screen b) It reads input from the user c) It allocates memory dynamically d) It closes an open file Answer: a) It prints formatted output to the screen Explanation: The printf() function in C is used to print formatted output

What is the purpose of the scanf() function in C? a) To read formatted input from the user b) To print output to the screen c) To allocate memory d) To close a file Answer: a) To read formatted input from the user Explanation: The scanf() function in C is used to read formatted input

What does the return 0; statement signify in the main() function? a) The program executed successfully b) The program encountered an error c) The program did not execute d) The program is paused Answer: a) The program executed successfully Explanation: The return 0; statement in the main() function signifies that the program executed successfully. In

What is the purpose of the main() function in C? a) It is the entry point of the program b) It allocates memory c) It defines global variables d) It handles file I/O Answer: a) It is the entry point of the program Explanation: The main() function in C is the entry point of the

What is the difference between argc and argv? a) argc is the count of arguments, argv is an array of arguments b) argv is the count of arguments, argc is an array of arguments c) Both are used to declare variables d) Both are used to allocate memory Answer: a) argc is the count of

How does argc function in C? a) It counts the number of command-line arguments passed b) It stores command-line arguments as strings c) It declares global variables d) It allocates memory dynamically Answer: a) It counts the number of command-line arguments passed Explanation: argc (argument count) is an integer parameter in C’s main() function that

What is the purpose of argv in C? a) It stores command-line arguments as an array of strings b) It counts the number of command-line arguments c) It declares variables d) It allocates memory Answer: a) It stores command-line arguments as an array of strings Explanation: The argv parameter in C’s main() function is an

What are command-line arguments in C used for? a) Passing input values to a program during execution b) Declaring variables c) Allocating memory d) Defining macros Answer: a) Passing input values to a program during execution Explanation: Command-line arguments in C allow users to pass input values to a program when it is executed. These

What is the difference between #include <file> and #include "file" in C? a) Angle brackets are for system files, quotes are for user-defined files b) There is no difference c) Quotes are for system files, angle brackets are for user-defined files d) Both include the same file type Answer: a) Angle brackets are for system

How does the #ifdef directive work in C? a) It conditionally includes code based on whether a macro is defined b) It includes a header file c) It allocates memory d) It declares a variable Answer: a) It conditionally includes code based on whether a macro is defined Explanation: The #ifdef (if defined) directive in

What is the purpose of the #define directive in C? a) To define macros and constants b) To include header files c) To allocate memory d) To declare variables Answer: a) To define macros and constants Explanation: The #define directive in C is used to define macros, which are pieces of code that are given

What is a header file in C? a) A file that contains function declarations and macros b) A file that contains the main function c) A file that is used for memory management d) A file that is used to store global variables Answer: a) A file that contains function declarations and macros Explanation: A

What is the purpose of command-line arguments in C? a) To pass arguments to a program at runtime b) To compile a program c) To declare global variables d) To manage memory allocation Answer: a) To pass arguments to a program at runtime Explanation: Command-line arguments in C allow users to pass information to a

What does the #include directive do in C? a) Includes the contents of a file in the program b) Declares a variable c) Allocates memory d) Executes a system command Answer: a) Includes the contents of a file in the program Explanation: The #include directive in C is used to include the contents of another

What is the purpose of the C preprocessor? a) To process directives before compilation b) To execute code at runtime c) To manage memory allocation d) To handle exceptions Answer: a) To process directives before compilation Explanation: The C preprocessor is a tool that processes directives before the actual compilation of the code begins. These

How does the fclose() function work in C? a) It closes an open file b) It writes data to a file c) It reads data from a file d) It deletes a file Answer: a) It closes an open file Explanation: The fclose() function in C is used to close an open file that was

What is the role of the fopen() function in C? a) To open a file for reading or writing b) To close a file c) To write data to a file d) To delete a file Answer: a) To open a file for reading or writing Explanation: The fopen() function in C is used to