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ECAT Computer Input Output Test Online

Mustansar KhanLast Updated: May 1, 2025

ECAT Computer Science Input/OutputTest

ECAT Computer Science Chapter 20 Input Output Online Test

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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ECAT Input/Output Test Online MCQs

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

scanf()

fscanf()

fprintf()

printf()

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

3. What does ferror() check?

End of file

File name

File permissions

If an error occurred during file I/O

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

Writes to a file

Reads an integer

Reads a character

Prints an integer

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

char

int

void *

FILE *

6. Which format specifier is used for character output?

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

fgetc()

getchar()

putch()

getch()

8. 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");

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

void

char

int

float

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

stop()

fileclose()

closefile()

fclose()

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

getch()

getchar()

pause()

break()

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

fflush(stdout);

clear();

remove();

flush()

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

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

printf()

getch()

scanf()

fopen()

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

read() and write()

getc() and putc()

fread() and fwrite()

fopenb()

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

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

scanf("%f", &x);

scanf("%d", &x);

scanf("%i", &x);

scanf("%d", x);

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

getch()

fgets()

puts()

scanf()

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

printf()

scanf()

get()

input()

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

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

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

getc()

getch()

freadchar()

readchar()

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

printf()

puts()

putch()

putchar()

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

string.h

stdlib.h

stdio.h

math.h

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

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

printf()

scanf()

fscanf()

puts()

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

putch()

scanf()

printf()

getc()

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

fread()

rewind()

ftell()

fseek()

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

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

getchar()

getch()

scanf()

gets()

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

printf()

print()

puts()

putchar()

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

scanf()

printf()

cin

cout

33. What will the function getchar() do?

Read an integer

Take string input

Display a character

Read a single character from the keyboard

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

conio.h

stdlib.h

stdio.h

string.h

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

fwrite()

putc()

fputs()

puts()

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

seekstart()

rewind()

reset()

startfile()

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

puts()

printf()

fprintf()

fputs()

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

fputchar()

putc()

fwrite()

printf()

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

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

scanf("%f", str);

scanf("%s", str);

scanf("%s", &str);

scanf("%c", str);

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

feof()

rewind()

ftell()

fseek()

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

fputs()

fprintf()

fwrite()

putc()

43. How many arguments can printf() accept?

Fixed to three

Only two

It depends on the format string

Only one

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

fseek()

ftell()

rewind()

filepos()

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

%lf

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

"rw"

"w+"

"r+"

"a+"

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

NULL

-1

48. What does fflush(stdin); do?

Reads a string

Clears the input buffer

Flushes output buffer

Writes to a file

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

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Mustansar KhanLast Updated: May 1, 2025

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ECAT Computer Input Output Test Online

ECAT Computer Science Input/OutputTest

ECAT Computer Science Chapter 20 Input Output Online Test

ECAT Input/Output Test Online MCQs

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