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.
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 does fflush(stdin); do?

Flushes output buffer

Clears the input buffer

Reads a string

Writes to a file

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

math.h

string.h

stdlib.h

stdio.h

3. How many arguments can printf() accept?

It depends on the format string

Only one

Fixed to three

Only two

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

stop()

closefile()

fclose()

fileclose()

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

printf()

puts()

putchar()

print()

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

fscanf()

puts()

printf()

scanf()

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

scanf("%d", x);

scanf("%f", &x);

scanf("%i", &x);

scanf("%d", &x);

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

NULL

-1

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

rewind()

fread()

ftell()

fseek()

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

fopenb()

getc() and putc()

fread() and fwrite()

read() and write()

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

scanf()

printf()

fopen()

getch()

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

FILE *

void *

int

char

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

putch()

getc()

printf()

scanf()

14. What will the function getchar() do?

Read a single character from the keyboard

Read an integer

Display a character

Take string input

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

fflush(stdout);

remove();

flush()

clear();

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

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

"r+"

"w+"

"rw"

"a+"

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

pause()

getchar()

getch()

break()

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

20. What does ferror() check?

If an error occurred during file I/O

File name

End of file

File permissions

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

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

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

feof()

rewind()

ftell()

fseek()

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

void

int

char

float

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

reset()

startfile()

rewind()

seekstart()

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

27. Which format specifier is used for character output?

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

freadchar()

getch()

readchar()

getc()

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

puts()

putchar()

printf()

putch()

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

putc()

fwrite()

fputs()

puts()

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

cin

scanf()

printf()

cout

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

fprintf()

fwrite()

fputs()

putc()

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

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

fprintf()

fscanf()

scanf()

printf()

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

fgetc()

putch()

getchar()

getch()

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

Prints an integer

Reads a character

Writes to a file

Reads an integer

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

scanf()

getch()

puts()

fgets()

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

fprintf()

printf()

puts()

fputs()

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

filepos()

rewind()

ftell()

fseek()

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

scanf("%f", str);

scanf("%s", &str);

scanf("%c", str);

scanf("%s", str);

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

stdio.h

string.h

stdlib.h

conio.h

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

get()

input()

printf()

scanf()

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

%lf

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

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

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

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

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

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

getch()

scanf()

gets()

getchar()

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

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

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

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

fputchar()

fwrite()

printf()

putc()

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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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