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Computer Input Output Test Online

Mustansar KhanLast Updated: October 15, 2025

Start your preparation for Computer Input Output 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 Input Output 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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Computer Input/Output Practice Test Online With Explanation

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1. What is the return value of scanf() when it successfully reads one input?

NULL

-1

2. What is the correct format specifier for printing an integer in C?

3. Which of the following functions allows formatted input from a file?

printf()

fprintf()

fscanf()

scanf()

4. Which function is used to print output to the screen in C?

scanf()

printf()

cout

cin

5. Which of the following is a non-formatted input/output function?

printf()

puts()

scanf()

fscanf()

6. Which function is used to read a string from the user?

getchar()

gets()

getch()

scanf()

7. Which of the following is a formatted output function for files?

fputs()

fprintf()

printf()

puts()

8. Which function would you use to input values into multiple variables?

scanf()

getc()

printf()

putch()

9. Which function is used to read a character from a file?

readchar()

getch()

getc()

freadchar()

10. What is the correct format specifier to print a double?

%lf

11. How many arguments can printf() accept?

Only one

It depends on the format string

Fixed to three

Only two

12. What will the function getchar() do?

Take string input

Read an integer

Read a single character from the keyboard

Display a character

13. Which function displays a string followed by a newline character?

puts()

putchar()

printf()

print()

14. Which header file is used for standard input and output functions in C?

conio.h

stdio.h

string.h

stdlib.h

15. Which of the following correctly opens a file for writing in C?

fopen("file.txt", "rb");

fopen("file.txt", "a+");

fopen("file.txt", "r");

fopen("file.txt", "w");

16. Which function resets the file pointer to the beginning of the file?

reset()

seekstart()

rewind()

startfile()

17. Which symbol is used to access the address of a variable?

18. Which of the following format specifiers is used for reading a float?

19. Which of the following can be used to print hexadecimal values?

20. Which escape sequence is used to print a new line?

21. Which function pauses the program until a key is pressed?

break()

pause()

getchar()

getch()

22. Which function is used to move the file pointer?

fseek()

fread()

ftell()

rewind()

23. Which of the following is used for binary file input/output?

read() and write()

fopenb()

getc() and putc()

fread() and fwrite()

24. Which function is used to write a block of data to a binary file?

fprintf()

putc()

fwrite()

fputs()

25. Which function reads a single character and echoes it to the screen?

getchar()

fgetc()

getch()

putch()

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26. Which function can be used to flush the output buffer?

clear();

fflush(stdout);

flush()

remove();

27. Which format specifier is used to print unsigned integers?

28. Which escape character is used for a horizontal tab?

29. Which I/O function is used for file input/output?

getch()

scanf()

printf()

fopen()

30. Which function is used to get the current position of the file pointer?

rewind()

ftell()

filepos()

fseek()

31. Which of the following functions writes a string to a file?

fputs()

fwrite()

puts()

putc()

32. Which of the following functions detects end-of-file?

ftell()

fseek()

rewind()

feof()

33. What does fflush(stdin); do?

Reads a string

Clears the input buffer

Writes to a file

Flushes output buffer

34. What is the return type of printf()?

void

int

char

float

35. What does ferror() check?

File name

If an error occurred during file I/O

File permissions

End of file

36. Which function is used to close an open file?

fileclose()

stop()

closefile()

fclose()

37. What is the format specifier for reading a string?

38. Which of the following correctly reads an integer input?

scanf("%i", &x);

scanf("%d", x);

scanf("%f", &x);

scanf("%d", &x);

39. What does scanf("%d", &x); do?

Reads an integer

Prints an integer

Reads a character

Writes to a file

40. Which function is used to read formatted input from the keyboard?

scanf()

get()

input()

printf()

41. Which function is safer to use instead of gets()?

scanf()

getch()

fgets()

puts()

42. Which format specifier is used for character output?

43. What is the return type of fopen()?

FILE *

void *

char

int

44. How do you read a character array (string) using scanf()?

scanf("%c", str);

scanf("%s", str);

scanf("%f", str);

scanf("%s", &str);

45. Which function is used to write a character to a file?

printf()

fwrite()

putc()

fputchar()

46. What is the output of printf("%c", 'A' + 1);?

47. Which mode opens a file for both reading and writing, starting at the beginning?

"w+"

"a+"

"r+"

"rw"

48. Which header file is required for getchar() and putchar()?

math.h

stdio.h

string.h

stdlib.h

49. Which function prints a single character to the screen?

puts()

putchar()

printf()

putch()

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