File Input Output- C Programming MCQ Questions and Answers

1

In C, which library is used for file operations such as reading and writing files?

A) stdio.h B) iostream.h C) fileio.h D) files.h

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Answer & Solution

Answer: Option A

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2

Which function is used to open a file in C for writing?

A) fopen() B) open() C) writefile() D) createfile()

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Answer & Solution

Answer: Option A

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3

What does 'FILE' represent in C when working with files?

A) A built-in data type for files B) A file descriptor C) A file pointer D) A file structure

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Answer & Solution

Answer: Option D

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4

How do you check if a file was opened successfully in C?

A) Use the 'filestatus' variable B) Check the return value of fopen() C) Use the 'fileopen' function D) Check the file's size

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Answer & Solution

Answer: Option B

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5

Which function is used to write data to a file in C?

A) fwrite() B) writefile() C) filewrite() D) putfile()

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Answer & Solution

Answer: Option A

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6

What is the difference between 'r' and 'w' modes when opening a file in C?

A) 'r' is for read-only and 'w' is for write-only B) 'r' is for reading and 'w' is for reading and writing C) 'r' is for read-only and 'w' is for write-only, creating a new file D) 'r' is for reading and 'w' is for writing, overwriting an existing file

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Answer & Solution

Answer: Option D

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7

How do you read a character from a file in C?

A) getc() B) readchar() C) read() D) getchar()

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Answer & Solution

Answer: Option A

Solution:

The correct answer is A: getc()
Let's break down why:
getc() is a standard C library function specifically designed to read a single character from a file stream.
It takes a file pointer (FILE*) as an argument and returns the character read (as an integer) or EOF if the end of the file is reached or an error occurs.
readchar() is not a standard C function for file input.
read() is a lower-level function (usually from the POSIX standard) used for reading a block of data from a file descriptor, not a single character.
getchar() reads a character from standard input (stdin), which is usually the keyboard, not from a file.
So, getc() is the correct function to use when you want to read a single character from a file in C.

8

What is the purpose of the 'fprintf' function in C?

A) To format and write data to a file B) To read data from a file C) To open a file D) To close a file

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Answer & Solution

Answer: Option A

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9

Which function is used to close a file in C?

A) closefile() B) fclose() C) endfile() D) fileclose()

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Answer & Solution

Answer: Option B

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10

In C, what is the function of the 'feof' function?

A) To check if the file has reached the end B) To find the size of a file C) To check if the file is open D) To check if the file exists

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Answer & Solution

Answer: Option A

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