C Programming

How to declare a double-pointer in C? a) int *ptr; b) int **ptr; c) int &ptr; d) int **ptr[2]; Answer: b) int **ptr; Explanation: A double-pointer (or pointer to a pointer) in C is declared as int **ptr;. This declaration means that ptr is a pointer to another pointer, which in turn points to an […]

How is the 3rd element in an array accessed based on pointer notation? a) *(arr + 2) b) *(arr + 3) c) *(arr + 1) d) arr[3] Answer: a) *(arr + 2) Explanation: In C, array elements can be accessed using pointer notation. The 3rd element of an array arr is accessed using *(arr +

How is an array initialized in C language? a) int arr[5] = {1, 2, 3, 4, 5}; b) int arr(5) = {1, 2, 3, 4, 5}; c) int arr[] = (1, 2, 3, 4, 5); d) int arr{} = {1, 2, 3, 4, 5}; Answer: a) int arr[5] = {1, 2, 3, 4, 5}; Explanation:

How are Strings represented in memory in C? a) As an array of characters b) As a linked list c) As a single character d) As a floating-point number Answer: a) As an array of characters Explanation: In C, strings are represented in memory as an array of characters terminated by a null character ('\0').

Which operator is used to access the value stored at a pointer address in C? a) & (ampersand) b) * (asterisk) c) -> (arrow) d) [] (brackets) Answer: b) * (asterisk) Explanation: The asterisk (*) operator, also known as the dereference operator, is used in C to access the value stored at a pointer address.

What is the maximum number of arguments that can be passed to a C function? a) 127 b) 255 c) 512 d) No fixed limit Answer: d) No fixed limit Explanation: In C, there is no fixed limit on the number of arguments that can be passed to a function. The only practical limitation is

Which of the following is not a valid C keyword? a) int b) float c) for d) main Answer: d) main Explanation: In C, int, float, and for are valid keywords with specific meanings, while main is not a keyword but rather a special function name. The main function is the entry point of a

What is the purpose of the ‘break’ statement in C? a) To terminate a loop or switch statement b) To skip an iteration of a loop c) To exit a function d) To define a block of code Answer: a) To terminate a loop or switch statement Explanation: The break statement in C is used

In C, which type of variable should be used to store decimal numbers? a) int b) float c) char d) void Answer: b) float Explanation: In C, the float data type is used to store decimal (floating-point) numbers. It typically occupies 4 bytes of memory and can represent a wide range of decimal values with

What is the purpose of the ‘sizeof’ operator in C? a) To determine the size of a variable or data type b) To allocate memory dynamically c) To find the length of a string d) To initialize an array Answer: a) To determine the size of a variable or data type Explanation: The sizeof operator

Which operator is used for ‘logical AND’ in C? a) & b) && c) || d) | Answer: b) && Explanation: The logical AND operator (&&) in C is used to combine two conditions, returning true only if both conditions are true. For example, the expression x > 0 && x < 10 is true

What is the default return type of a function in C if not specified? a) int b) void c) float d) char Answer: a) int Explanation: In C, if a function’s return type is not explicitly specified, it defaults to int. This behavior stems from older versions of C, where functions without a specified return

Which symbol is used for the ‘modulo’ operation in C? a) + b) – c) % d) / Answer: c) % Explanation: The modulo operator (%) in C is used to find the remainder of the division of two integers. For example, 5 % 2 results in 1, because 5 divided by 2 leaves a

What is the correct syntax for declaring a variable in C? a) var int x; b) int x; c) int = x; d) int: x; Answer: b) int x; Explanation: The correct syntax for declaring a variable in C involves specifying the data type followed by the variable name. For example, int x; declares an

Which data type is used to represent a single character in C? a) int b) float c) char d) double Answer: c) char Explanation: The char data type in C is used to represent a single character. It typically occupies 1 byte of memory and can hold any character from the ASCII character set. The

Which character is used to indicate the end of a statement in C? a) , (comma) b) : (colon) c) ; (semicolon) d) . (period) Answer: c) ; (semicolon) Explanation: In C, the semicolon (;) is used to indicate the end of a statement. It is a crucial syntax element in C programming, as it

What is the primary purpose of a function prototype in C? a) To define the function body b) To specify the function’s return type and parameters c) To allocate memory for the function d) To initialize a function Answer: b) To specify the function’s return type and parameters Explanation: A function prototype in C is

What is the significance of the ‘volatile’ keyword in C? a) It ensures a variable’s value is read from main memory, not from a CPU cache b) It prevents a variable from being modified c) It makes a variable thread-safe d) It converts a variable to a constant Answer: a) It ensures a variable’s value

Which header file is used for mathematical functions in C? a) stdlib.h b) math.h c) string.h d) stdio.h Answer: b) math.h Explanation: The math.h header file in C is used to include mathematical functions such as sin(), cos(), sqrt(), pow(), and many others. These functions are essential for performing complex mathematical calculations in C programs.

What is the purpose of the ‘goto’ statement in C? a) To define a loop b) To terminate a program c) To jump to a specific labeled statement d) To return a value from a function Answer: c) To jump to a specific labeled statement Explanation: The goto statement in C is used to jump

Which operator is used to access the value stored at a pointer address in C? a) & (ampersand) b) * (asterisk) c) -> (arrow) d) [] (brackets) Answer: b) * (asterisk) Explanation: The asterisk (*) operator, also known as the dereference operator, is used in C to access the value stored at a pointer address.

What is the purpose of the ‘scanf’ function in C? a) To print output to the console b) To allocate memory c) To read formatted input from the console d) To terminate a program Answer: c) To read formatted input from the console Explanation: The scanf() function in C is used to read formatted input

Which library function is used to allocate memory dynamically in C? a) malloc() b) scanf() c) free() d) printf() Answer: a) malloc() Explanation: The malloc() function in C is used to allocate memory dynamically. It allocates a specified number of bytes and returns a pointer to the allocated memory. For example, int *ptr = (int

What does the ‘NULL’ keyword represent in C? a) A zero value b) A pointer that does not point to any object or function c) An undefined value d) A memory address Answer: b) A pointer that does not point to any object or function Explanation: In C, the NULL keyword represents a pointer that

What is the purpose of the ‘sizeof’ operator in C? a) To determine the size of a variable or data type b) To allocate memory dynamically c) To find the length of a string d) To initialize an array Answer: a) To determine the size of a variable or data type Explanation: The sizeof operator