C Programming — File Handling Questions & Answers

Q.1 Easy File Handling

In a file processing application, what is the primary difference between 'wb' and 'w' file modes?

A 'wb' opens in binary mode while 'w' opens in text mode

B 'w' is faster than 'wb'

C 'wb' allows reading while 'w' does not

D There is no difference in modern C compilers

Correct Answer: A. 'wb' opens in binary mode while 'w' opens in text mode

EXPLANATION

'w' opens file in text mode (converts line endings), while 'wb' opens in binary mode (no conversion). This matters when handling platform-specific line endings (\r\n vs \n).

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Q.2 Easy File Handling

Which function is used to check if the end-of-file (EOF) has been reached in C file handling?

A feof(fp)

B eof(fp)

C iseof(fp)

D checkeof(fp)

Correct Answer: A. feof(fp)

EXPLANATION

feof() is the standard C library function that returns non-zero if EOF has been reached on the given file stream. Other options are not valid C functions.

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Q.3 Easy File Handling

Which mode opens file in text format with write permission only?

A wb

B w

C wt

D wa

Correct Answer: B. w

EXPLANATION

'w' mode opens file in text format for writing. 'wb' is binary write. 'wt' is explicitly text write but 'w' is default text mode.

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Q.4 Easy File Handling

Which function returns the current position of file pointer?

A fgetpos()

B ftell()

C fseek()

D rewind()

Correct Answer: B. ftell()

EXPLANATION

ftell() returns the current file position as a long integer. fgetpos() stores position in a fpos_t structure. rewind() resets to beginning.

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Q.5 Easy File Handling

What does fseek(fp, 0, SEEK_END) accomplish?

A Moves pointer to beginning of file

B Moves pointer to end of file

C Moves pointer to current position

D Closes the file pointer

Correct Answer: B. Moves pointer to end of file

EXPLANATION

SEEK_END moves the file pointer to the end of file. SEEK_SET goes to beginning, SEEK_CUR to current position.

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Q.6 Easy File Handling

Which file opening mode allows both reading and writing without truncating existing content?

A r+

B w+

C a+

D x+

Correct Answer: A. r+

EXPLANATION

Mode 'r+' opens file for reading and writing without truncating. 'w+' truncates the file, 'a+' appends, and 'x+' is for exclusive creation.

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Q.7 Easy File Handling

In C file handling, what does rewind(fp) do?

A Moves the file pointer to the beginning of the file

B Closes and reopens the file

C Moves the file pointer to the end of the file

D Flushes the file buffer

Correct Answer: A. Moves the file pointer to the beginning of the file

EXPLANATION

rewind(fp) repositions the file pointer to the start of the file. It's equivalent to fseek(fp, 0, SEEK_SET).

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Q.8 Easy File Handling

What is the return value of feof(fp) when the end of file is reached?

A Non-zero value (true)

B Zero (false)

C -1

D NULL pointer

Correct Answer: A. Non-zero value (true)

EXPLANATION

feof(fp) returns a non-zero value when EOF (End Of File) is reached, and returns zero when not at EOF.

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Q.9 Easy File Handling

Which function is used to write a single character to a file?

A fputc()

B fgetc()

C fwrite()

D fprintf()

Correct Answer: A. fputc()

EXPLANATION

fputc() writes a single character to the specified file. fgetc() reads a character, fwrite() writes blocks, and fprintf() writes formatted output.

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Q.10 Easy File Handling

What does the 'w+' mode do when opening a file with fopen()?

A Opens file for reading and writing, creates if doesn't exist

B Opens file for writing only, appends data at end

C Opens file for reading only

D Opens file in binary write mode

Correct Answer: A. Opens file for reading and writing, creates if doesn't exist

EXPLANATION

'w+' mode opens a file for both reading and writing. If the file doesn't exist, it creates a new one. If it exists, it truncates the file to zero length.

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