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

2. What will the function getchar() do?

Read an integer

Take string input

Read a single character from the keyboard

Display a character

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

scanf()

getc()

printf()

putch()

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

scanf("%d", x);

scanf("%i", &x);

scanf("%f", &x);

scanf("%d", &x);

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

print()

putchar()

printf()

puts()

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

printf()

putc()

fwrite()

fputchar()

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

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

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

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

puts()

scanf()

fgets()

getch()

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

string.h

math.h

stdlib.h

stdio.h

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

ftell()

rewind()

feof()

fseek()

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

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

"a+"

"w+"

"rw"

"r+"

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

reset()

rewind()

startfile()

seekstart()

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

getch()

getchar()

scanf()

gets()

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

putc()

fwrite()

fprintf()

fputs()

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

%lf

19. What does fflush(stdin); do?

Flushes output buffer

Clears the input buffer

Writes to a file

Reads a string

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

putchar()

puts()

printf()

putch()

21. Which format specifier is used for character output?

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

fgetc()

putch()

getch()

getchar()

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

FILE *

char

int

void *

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

cout

printf()

scanf()

cin

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

fprintf()

fscanf()

printf()

scanf()

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

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

puts()

printf()

fscanf()

scanf()

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

scanf()

getch()

printf()

fopen()

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

getchar()

pause()

getch()

break()

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

float

void

char

int

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

stdlib.h

stdio.h

string.h

conio.h

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

scanf("%f", str);

scanf("%s", &str);

scanf("%c", str);

scanf("%s", str);

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

freadchar()

readchar()

getc()

getch()

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

flush()

fflush(stdout);

clear();

remove();

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

input()

scanf()

printf()

get()

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

Prints an integer

Reads a character

Reads an integer

Writes to a file

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

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

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

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

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

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

-1

NULL

39. What does ferror() check?

File permissions

End of file

File name

If an error occurred during file I/O

40. How many arguments can printf() accept?

Only one

It depends on the format string

Only two

Fixed to three

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

filepos()

fseek()

ftell()

rewind()

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

fclose()

stop()

fileclose()

closefile()

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

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

fopenb()

fread() and fwrite()

getc() and putc()

read() and write()

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

printf()

fprintf()

puts()

fputs()

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

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

puts()

fputs()

fwrite()

putc()

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

ftell()

fseek()

rewind()

fread()

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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Mustansar Khan

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ECAT Computer Science Input/OutputTest

ECAT Computer Science Chapter 20 Input Output Online Test

ECAT Input/Output Test Online MCQs

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Mustansar Khan

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