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

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

fileclose()

stop()

fclose()

closefile()

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

getch()

freadchar()

getc()

readchar()

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

puts()

fwrite()

putc()

fputs()

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

puts()

printf()

fscanf()

scanf()

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

putchar()

printf()

puts()

print()

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

fseek()

fread()

ftell()

rewind()

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

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

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

string.h

stdlib.h

stdio.h

conio.h

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

fputchar()

putc()

fwrite()

printf()

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

"a+"

"w+"

"rw"

"r+"

13. How many arguments can printf() accept?

Only one

It depends on the format string

Fixed to three

Only two

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

%lf

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

read() and write()

fread() and fwrite()

getc() and putc()

fopenb()

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

rewind()

ftell()

fseek()

filepos()

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

scanf("%c", str);

scanf("%s", &str);

scanf("%s", str);

scanf("%f", str);

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

putc()

fputs()

fprintf()

fwrite()

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

getch()

gets()

getchar()

scanf()

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

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

stdio.h

stdlib.h

string.h

math.h

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

scanf("%f", &x);

scanf("%i", &x);

scanf("%d", x);

scanf("%d", &x);

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

void

float

int

char

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

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

getchar()

pause()

break()

getch()

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

startfile()

rewind()

reset()

seekstart()

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

-1

NULL

28. What does ferror() check?

File permissions

If an error occurred during file I/O

File name

End of file

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

putchar()

puts()

printf()

putch()

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

getch()

putch()

fgetc()

getchar()

31. Which format specifier is used for character output?

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

cout

printf()

scanf()

cin

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

scanf()

fgets()

puts()

getch()

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

rewind()

ftell()

fseek()

feof()

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

void *

FILE *

char

int

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

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

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

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

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

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

printf()

fputs()

fprintf()

puts()

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

fscanf()

fprintf()

printf()

scanf()

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

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

41. What does fflush(stdin); do?

Writes to a file

Reads a string

Flushes output buffer

Clears the input buffer

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

get()

printf()

scanf()

input()

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

getch()

printf()

scanf()

fopen()

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

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

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

clear();

flush()

fflush(stdout);

remove();

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

getc()

putch()

printf()

scanf()

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

Writes to a file

Prints an integer

Reads an integer

Reads a character

49. What will the function getchar() do?

Read a single character from the keyboard

Read an integer

Take string input

Display a character

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Mustansar KhanLast Updated: October 15, 2025

Important Computer Input Output Question and Answer

Computer Input/Output Practice Test Online With Explanation

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Study Plan for Computer Input Output Test Online

How to Use GoTest for Preparation:

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