Computer Elements of “C” Test Online

Mustansar KhanLast Updated: October 15, 2025

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

/* */

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

#define

const

macro

define

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

Brackets []

Curly braces {}

Parentheses ()

Angle brackets

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

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

"A"

'A'

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

copystr()

strcpy()

strcopy()

assign()

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

struct

alias

typedef

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

Depends on the compiler

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

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

scanf

printf

while

11. What does the keyword static do?

Frees memory

Preserves the value of a variable between function calls

Allows modification

Makes a variable global

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

stop()

terminate()

exit()

end()

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

Function

Interface

Class

Object

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

func myFunction()

function myFunction()

def myFunction()

void myFunction();

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

16. What does getch() function do?

Prints a character

Compares characters

Reads a single character without echoing

Terminates the program

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

const int

constant

#define

static

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

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

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

condition ? if : else

if ? then : else

if (condition) then else

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

int = fun()

declare fun()

function fun()

void fun()

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

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

scanf()

exit()

printf()

malloc()

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

stdlib.h

conio.h

string.h

stdio.h

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

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

sizeof()

strlen()

length()

strlength()

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

float

short

char

int

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

0 to 255

1 to 255

-128 to 127

0 to 127

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

true

false

29. What does the keyword extern indicate?

A variable defined elsewhere

A variable with garbage value

A local variable

A private variable

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

append()

strcpy()

strcat()

stradd()

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

string.h

math.h

stdlib.h

stdio.h

32. Which of these is a bitwise operator?

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

Array

Function

Variable

Constant

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

final

const

static

extern

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

str name;

char name[20];

string name[20];

char name(20);

36. What is a pointer?

A data type

A variable that stores an address

A compiler error

A keyword

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

object

define

typedef

struct

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

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

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

Both A and B

int *p = 0;

int *p = NULL;

int p = NULL;

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

+, -, *, /

*, +, /, -

*, /, +, -

/, *, -, +

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

NULL

Garbage value

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

extern

loop

volatile

static

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

break

switch

continue

for

45. Which format specifier is used for double values?

%lf

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

select

for

while

do-while

47. Which operator has the highest precedence?

()

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

It stops the program

It returns success to the operating system

It sends 0 to the compiler

It initializes a variable

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

auto

static

private

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Mustansar KhanLast Updated: October 15, 2025

Important Computer Elements of “C” Question and Answer

Elements of “C” Practice Test Online With Explanation

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