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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.
Test Helpful For:	ECAT Entry Test Computer Online Test Interview Questions about Computer All Universities Entrance Test Recruitments Tests

ECAT Input/Output Test Online MCQs

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

string.h

stdio.h

stdlib.h

conio.h

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

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

fputs()

fwrite()

putc()

fprintf()

4. What will the function getchar() do?

Read a single character from the keyboard

Read an integer

Display a character

Take string input

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

fgetc()

getch()

putch()

getchar()

6. How many arguments can printf() accept?

Only one

Fixed to three

Only two

It depends on the format string

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

math.h

string.h

stdlib.h

stdio.h

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

scanf()

fscanf()

fprintf()

printf()

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

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

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

fputchar()

putc()

printf()

fwrite()

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

puts()

fwrite()

putc()

fputs()

13. What does fflush(stdin); do?

Flushes output buffer

Clears the input buffer

Reads a string

Writes to a file

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

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

ftell()

fseek()

feof()

rewind()

16. Which format specifier is used for character output?

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

stop()

fclose()

fileclose()

closefile()

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

putchar()

putch()

puts()

printf()

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

fseek()

rewind()

ftell()

fread()

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

scanf()

gets()

getchar()

getch()

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

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

%lf

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

print()

printf()

puts()

putchar()

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

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

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

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

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

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

Reads a character

Reads an integer

Prints an integer

Writes to a file

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

putch()

scanf()

getc()

printf()

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

fprintf()

puts()

printf()

fputs()

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

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

int

char

void *

FILE *

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

31. What does ferror() check?

If an error occurred during file I/O

End of file

File name

File permissions

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

char

int

void

float

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

readchar()

getch()

getc()

freadchar()

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

rewind()

fseek()

filepos()

ftell()

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

input()

printf()

get()

scanf()

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

getch()

pause()

getchar()

break()

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

flush()

clear();

remove();

fflush(stdout);

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

scanf("%d", &x);

scanf("%d", x);

scanf("%i", &x);

scanf("%f", &x);

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

getc() and putc()

read() and write()

fread() and fwrite()

fopenb()

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

cout

printf()

scanf()

cin

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

getch()

puts()

scanf()

fgets()

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

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

fscanf()

puts()

scanf()

printf()

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

scanf("%s", str);

scanf("%s", &str);

scanf("%c", str);

scanf("%f", str);

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

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

printf()

scanf()

getch()

fopen()

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

NULL

-1

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

"a+"

"w+"

"r+"

"rw"

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

rewind()

seekstart()

startfile()

reset()

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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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ECAT Computer Science Input/OutputTest

ECAT Computer Science Chapter 20 Input Output Online Test

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