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

fputchar()

putc()

fwrite()

printf()

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

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

printf()

fscanf()

scanf()

fprintf()

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

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

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

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

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

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

printf()

scanf()

fscanf()

puts()

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

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

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

string.h

conio.h

stdio.h

stdlib.h

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

puts()

putc()

fwrite()

fputs()

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

stdlib.h

math.h

string.h

stdio.h

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

NULL

-1

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

printf()

puts()

putch()

putchar()

13. What will the function getchar() do?

Read a single character from the keyboard

Read an integer

Take string input

Display a character

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

getc()

readchar()

getch()

freadchar()

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

fileclose()

fclose()

closefile()

stop()

16. What does ferror() check?

End of file

File name

If an error occurred during file I/O

File permissions

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

read() and write()

fread() and fwrite()

fopenb()

getc() and putc()

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

flush()

remove();

clear();

fflush(stdout);

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

Prints an integer

Reads an integer

Writes to a file

Reads a character

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

fread()

ftell()

fseek()

rewind()

21. How many arguments can printf() accept?

Only one

Fixed to three

It depends on the format string

Only two

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

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

ftell()

rewind()

filepos()

fseek()

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

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

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

puts()

scanf()

fgets()

getch()

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

FILE *

void *

char

int

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

putch()

fgetc()

getch()

getchar()

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

scanf("%i", &x);

scanf("%d", x);

scanf("%d", &x);

scanf("%f", &x);

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

rewind()

fseek()

ftell()

feof()

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

get()

scanf()

input()

printf()

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

fputs()

puts()

printf()

fprintf()

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

"r+"

"a+"

"rw"

"w+"

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

fprintf()

fwrite()

putc()

fputs()

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

getch()

scanf()

gets()

getchar()

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

scanf("%c", str);

scanf("%f", str);

scanf("%s", &str);

scanf("%s", str);

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

void

char

int

float

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

getc()

putch()

scanf()

printf()

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

getch()

break()

pause()

getchar()

40. What does fflush(stdin); do?

Reads a string

Clears the input buffer

Flushes output buffer

Writes to a file

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

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

reset()

startfile()

rewind()

seekstart()

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

printf()

getch()

scanf()

fopen()

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

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

printf()

putchar()

puts()

print()

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

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

scanf()

printf()

cout

cin

48. Which format specifier is used for character output?

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

%lf

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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

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