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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.
Test Helpful For:	ECAT Entry Test Computer Online Test Interview Questions about Computer All Universities Entrance Test Recruitments Tests

Computer Input/Output Practice Test Online With Explanation

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1. How many arguments can printf() accept?

Fixed to three

It depends on the format string

Only two

Only one

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

3. What does fflush(stdin); do?

Writes to a file

Clears the input buffer

Reads a string

Flushes output buffer

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

cout

cin

scanf()

printf()

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

scanf("%d", x);

scanf("%i", &x);

scanf("%d", &x);

scanf("%f", &x);

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

puts()

fprintf()

fputs()

printf()

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

8. Which format specifier is used for character output?

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

printf()

scanf()

fopen()

getch()

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

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

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

seekstart()

rewind()

startfile()

reset()

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

read() and write()

fopenb()

getc() and putc()

fread() and fwrite()

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

NULL

-1

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

putchar()

printf()

puts()

print()

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

math.h

string.h

stdio.h

stdlib.h

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

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

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

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

closefile()

fileclose()

stop()

fclose()

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

stdio.h

conio.h

stdlib.h

string.h

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

getch()

getchar()

break()

pause()

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

void

int

char

float

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

fseek()

ftell()

rewind()

feof()

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

ftell()

fseek()

fread()

rewind()

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26. What does ferror() check?

File name

End of file

If an error occurred during file I/O

File permissions

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

%lf

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

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

scanf("%c", str);

scanf("%s", str);

scanf("%f", str);

scanf("%s", &str);

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

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

putc()

printf()

fputchar()

fwrite()

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

getch()

puts()

fgets()

scanf()

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

puts()

scanf()

printf()

fscanf()

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

fgetc()

getch()

getchar()

putch()

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

input()

get()

scanf()

printf()

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

getch()

scanf()

gets()

getchar()

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

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

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

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

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

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

putch()

puts()

printf()

putchar()

39. What will the function getchar() do?

Read a single character from the keyboard

Take string input

Read an integer

Display a character

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

int

void *

char

FILE *

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

putc()

puts()

fwrite()

fputs()

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

scanf()

putch()

getc()

printf()

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

fflush(stdout);

clear();

remove();

flush()

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

fprintf()

putc()

fputs()

fwrite()

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

fseek()

ftell()

filepos()

rewind()

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

getc()

readchar()

getch()

freadchar()

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

printf()

scanf()

fprintf()

fscanf()

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

"rw"

"w+"

"a+"

"r+"

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

Writes to a file

Reads an integer

Reads a character

Prints an integer

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