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Computer Input Output Test Online

Mustansar KhanLast Updated: October 15, 2025

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 format specifier for reading a string?

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

puts()

putc()

fwrite()

fputs()

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

rewind()

reset()

seekstart()

startfile()

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

puts()

print()

printf()

putchar()

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

%lf

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

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

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

scanf("%f", str);

scanf("%c", str);

scanf("%s", str);

scanf("%s", &str);

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

remove();

fflush(stdout);

flush()

clear();

10. How many arguments can printf() accept?

It depends on the format string

Fixed to three

Only one

Only two

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

Prints an integer

Reads a character

Reads an integer

Writes to a file

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

feof()

fseek()

rewind()

ftell()

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

NULL

-1

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

printf()

puts()

putchar()

putch()

15. What does ferror() check?

If an error occurred during file I/O

File permissions

File name

End of file

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

fopen()

getch()

scanf()

printf()

17. Which format specifier is used for character output?

18. What does fflush(stdin); do?

Flushes output buffer

Clears the input buffer

Reads a string

Writes to a file

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

stdlib.h

string.h

math.h

stdio.h

20. What will the function getchar() do?

Read an integer

Read a single character from the keyboard

Take string input

Display a character

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

int

char

FILE *

void *

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

fgetc()

getch()

putch()

getchar()

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

scanf()

fgets()

getch()

puts()

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

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

fputchar()

fwrite()

printf()

putc()

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

closefile()

fileclose()

stop()

fclose()

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

fread() and fwrite()

fopenb()

getc() and putc()

read() and write()

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

printf()

scanf()

fscanf()

fprintf()

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

break()

getchar()

getch()

pause()

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

"a+"

"r+"

"w+"

"rw"

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

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

string.h

conio.h

stdio.h

stdlib.h

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

getc()

getch()

readchar()

freadchar()

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

filepos()

rewind()

ftell()

fseek()

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

input()

get()

scanf()

printf()

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

cin

cout

scanf()

printf()

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

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

printf()

scanf()

puts()

fscanf()

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

rewind()

fseek()

fread()

ftell()

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

scanf("%i", &x);

scanf("%f", &x);

scanf("%d", x);

scanf("%d", &x);

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

putc()

fprintf()

fputs()

fwrite()

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

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

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

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

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

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

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

getch()

scanf()

gets()

getchar()

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

printf()

putch()

getc()

scanf()

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

fputs()

printf()

puts()

fprintf()

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

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

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

void

char

int

float

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Mustansar KhanLast Updated: October 15, 2025

Computer Input Output Test Online

Important Computer Input Output Question and Answer

Computer Input/Output Practice Test Online With Explanation

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