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Computer Elements of “C” Test Online

Mustansar KhanLast Updated: October 15, 2025

Start your preparation for Computer Elements of “C” Test Online. This online test contains important MCQs from past papers. Attempting this test will help you prepare for Annual Exams and Entry Tests. Read the questions carefully and select the correct option below to see your result.

Important Computer Elements of “C” Question and Answer

Total Questions:	50
Time Allowed:	25 Minutes
Total Marks:	50
How to Attempt Test:	Please choose the right Option in MCQ-type question.
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Elements of “C” Practice Test Online With Explanation

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Page 1 of 2

1. What will the statement int a = 10, b = 3; printf("%d", a % b); print?

2. What is the default value of a global variable in C?

NULL

Garbage value

3. What is the function of return 0; in main()?

It returns success to the operating system

It sends 0 to the compiler

It stops the program

It initializes a variable

4. Which symbol is used to begin a preprocessor directive?

5. Which of these is a decision-making structure in C?

while

scanf

printf

6. Which keyword is used to prevent a variable from being modified?

static

extern

const

final

7. Which of the following is used to create a multi-line comment in C?

/* */

8. What is a pointer?

A compiler error

A data type

A keyword

A variable that stores an address

9. What is the keyword used to define a macro?

const

define

macro

#define

10. What is the range of values for a char in C?

1 to 255

-128 to 127

0 to 255

0 to 127

11. Which of the following is an example of a looping construct?

switch

continue

break

for

12. Which of the following is not a keyword in C?

extern

loop

static

volatile

13. What does the keyword static do?

Allows modification

Makes a variable global

Preserves the value of a variable between function calls

Frees memory

14. Which keyword is used to define a structure in C?

typedef

struct

object

define

15. What is the correct way to initialize a pointer to NULL?

Both A and B

int *p = NULL;

int p = NULL;

int *p = 0;

16. Which of the following is the correct order of evaluation?

*, /, +, -

/, *, -, +

*, +, /, -

+, -, *, /

17. Which data type can be used to store a decimal number?

int

char

float

short

18. Which operator is used to compare if two values are not equal?

19. Which library must be included to use malloc()?

stdio.h

conio.h

stdlib.h

string.h

20. What will be the output of sizeof(char) on most systems?

21. Which of the following is used for dynamic memory allocation?

exit()

scanf()

malloc()

printf()

22. What is the output of: printf("%d", sizeof(5.5));?

Depends on the compiler

23. Which of the following is used to store a group of related values?

Constant

Variable

Function

Array

24. Which operator has the highest precedence?

()

25. Which of the following is a fundamental element of a C program?

Class

Interface

Function

Object

Page 2 of 2

26. Which of the following is a valid arithmetic operator in C?

27. What is the correct syntax for a ternary operator in C?

if (condition) then else

condition ? if : else

if ? then : else

(condition) ? (true value) : (false value)

28. Which operator is used to increment a value by 1?

29. Which is the correct declaration of a function in C?

void myFunction();

func myFunction()

function myFunction()

def myFunction()

30. Which of the following is used to terminate a C program?

end()

stop()

terminate()

exit()

31. Which of these is a bitwise operator?

32. Which format specifier is used for double values?

%lf

33. Which of the following is used to define a block of code in C?

Angle brackets

Brackets []

Parentheses ()

Curly braces {}

34. Which of the following can be used to copy strings in C?

strcpy()

copystr()

assign()

strcopy()

35. Which operator is used to access the value stored at an address?

36. Which of the following is not a looping structure in C?

for

do-while

while

select

37. Which of the following is the correct syntax to declare a string?

string name[20];

str name;

char name[20];

char name(20);

38. Which header file includes the strlen() function?

stdio.h

string.h

math.h

stdlib.h

39. Which function is used to find the length of a string?

strlen()

length()

sizeof()

strlength()

40. What does the keyword extern indicate?

A variable with garbage value

A local variable

A private variable

A variable defined elsewhere

41. Which of these is not a storage class in C?

auto

static

private

42. Which of the following is used to define a symbolic constant in C?

const int

static

constant

#define

43. Which of the following functions is used to concatenate two strings?

append()

stradd()

strcpy()

strcat()

44. Which of the following function declarations is valid in C?

declare fun()

function fun()

int = fun()

void fun()

45. Which of the following is a compound assignment operator?

46. Which of the following is a valid character constant in C?

'A'

"A"

47. What is the output of printf("%d", 3 == 3);?

false

true

48. What does getch() function do?

Prints a character

Reads a single character without echoing

Terminates the program

Compares characters

49. Which keyword is used to define a user-defined data type alias?

struct

alias

typedef

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