What is the correct way to open a file in read mode in C?

fopen(“file.txt”, “r”);

open(“file.txt”, “read”);

file.open(“file.txt”, “r”);

What is the purpose of the ‘static’ keyword when applied to a local variable in C?

It preserves the variable’s value between function calls

It makes the variable accessible across multiple files

It allocates the variable on the heap instead of the stack

It prevents the variable from being modified

Which of the following correctly describes a pointer in C?

A variable that stores a memory address

A variable that can point to multiple values

A function that returns a memory address

What is the difference between ‘malloc()’ and ‘calloc()’ in C?

malloc() allocates memory for a single variable, calloc() for an array

malloc() takes one parameter, calloc() takes two

malloc() doesn’t initialize memory, calloc() initializes it to zero

What is a dangling pointer in C?

A pointer that points to a variable that has been deleted

A pointer that hasn’t been initialized

What is the purpose of the ‘volatile’ keyword in C?

To indicate that a variable can be changed by external factors

To prevent a variable from being modified

To allocate the variable in read-only memory

To make the variable thread-safe

Which of the following is true about function pointers in C?

They can be used to implement callbacks

They can only point to void functions

They are not supported in standard C

They cannot be passed as function arguments

What is the purpose of the ‘union’ data type in C?

To allow multiple variables to share the same memory location

To create a collection of different data types

To combine multiple structures into one

To create thread-safe variables

What is the purpose of the ‘restrict’ keyword in C?

To indicate that a pointer doesn’t alias with other pointers

To prevent a variable from being modified

To restrict the scope of a variable

To make a variable thread-local

What is the difference between ‘struct’ and ‘typedef struct’ in C?

typedef struct creates a new type that doesn’t need the struct keyword when declaring variables

struct can only contain primitive data types

typedef struct allows inheritance between structures

What is a memory leak in C?

When allocated memory is not freed after use

When a program uses more memory than allocated

When memory is corrupted by buffer overflow

When memory is accessed after being freed

What is the purpose of the ‘extern’ keyword in C?

To define a variable that exists in another file

To prevent a variable from being modified

What is the purpose of the ‘const’ qualifier when used with pointers?

const int *p: p can point to different locations, but cannot modify the value it points to

int * const p: p cannot point to different locations, but can modify the value it points to

const int * const p: p cannot point to different locations and cannot modify the value it points to

What is the purpose of the ‘#pragma’ directive in C?

To provide instructions to the compiler

What is the difference between ‘malloc()’ and ‘realloc()’ in C?

malloc() allocates new memory, realloc() resizes previously allocated memory

malloc() allocates memory on the stack, realloc() on the heap

malloc() takes one parameter, realloc() takes three

What is the purpose of the ‘offsetof’ macro in C?

To find the offset of a member within a structure

To calculate the difference between two pointers

To find the size of a structure

What is the purpose of the ‘inline’ keyword in C?

To suggest that a function be expanded inline when called

C Programming Quiz

Authored by Bader Saad

Computers

University

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51 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the common file extension for C language files?

.cpp

.java

.py

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is the correct way to declare a variable in C?

var x = 10;

int x = 10;

x = 10;

define x = 10;

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which symbol is used to indicate a single-line comment in C?

–

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the output of printf(“%d”, 5/2); in C?

2.5

Error

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which header file is required to use the printf() function?

math.h

string.h

stdio.h

stdlib.h

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the size of the int data type in C (on most modern systems)?

1 byte

2 bytes

4 bytes

8 bytes

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is NOT a valid variable name in C?

_variable

variable1

1variable

variable_name

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C Programming Quiz

What is the common file extension for C language files?

Which of the following is the correct way to declare a variable in C?

Which symbol is used to indicate a single-line comment in C?

What is the output of printf(“%d”, 5/2); in C?

Which header file is required to use the printf() function?

What is the size of the int data type in C (on most modern systems)?

Which of the following is NOT a valid variable name in C?

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

What is the output of printf(“%d”, ‘B’); in C?

Which operator is used to access the value at an address in C?

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