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 ferror() check?

File permissions

End of file

If an error occurred during file I/O

File name

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

puts()

printf()

putchar()

print()

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

scanf("%f", &x);

scanf("%i", &x);

scanf("%d", &x);

scanf("%d", x);

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

putc()

puts()

fwrite()

fputs()

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

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

fprintf()

printf()

puts()

fputs()

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

filepos()

ftell()

rewind()

fseek()

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

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

scanf()

putch()

getc()

printf()

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

Reads an integer

Writes to a file

Reads a character

Prints an integer

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

printf()

getch()

fopen()

scanf()

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

getc()

freadchar()

getch()

readchar()

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

flush()

clear();

fflush(stdout);

remove();

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

fprintf()

scanf()

fscanf()

printf()

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

scanf()

get()

printf()

input()

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

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

cout

cin

scanf()

printf()

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

FILE *

char

void *

int

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

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

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

rewind()

seekstart()

reset()

startfile()

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

feof()

fseek()

ftell()

rewind()

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

ftell()

rewind()

fseek()

fread()

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

getch()

fgetc()

putch()

getchar()

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

"w+"

"a+"

"r+"

"rw"

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

putc()

fputchar()

fwrite()

printf()

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

scanf()

fgets()

puts()

getch()

28. What will the function getchar() do?

Read an integer

Take string input

Display a character

Read a single character from the keyboard

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

getch()

gets()

scanf()

getchar()

30. Which format specifier is used for character output?

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

string.h

math.h

stdio.h

stdlib.h

32. What does fflush(stdin); do?

Flushes output buffer

Reads a string

Writes to a file

Clears the input buffer

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

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

getchar()

pause()

break()

getch()

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

fwrite()

putc()

fprintf()

fputs()

36. How many arguments can printf() accept?

Only two

Fixed to three

It depends on the format string

Only one

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

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

scanf("%s", str);

scanf("%s", &str);

scanf("%f", str);

scanf("%c", str);

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

void

float

char

int

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

%lf

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

scanf()

printf()

puts()

fscanf()

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

NULL

-1

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

stdio.h

string.h

stdlib.h

conio.h

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

puts()

putchar()

putch()

printf()

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

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

fclose()

fileclose()

stop()

closefile()

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

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

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

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

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

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

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

read() and write()

fread() and fwrite()

fopenb()

getc() and 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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