C Programming Week 13
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Questions and Answers

What function is used to read a character from a file?

  • fputs
  • fgetc (correct)
  • putw
  • fprintf

Which function would correctly write an integer value to a file?

  • fprintf
  • fgets
  • putw (correct)
  • fputc

What is the purpose of the fgets function?

  • To read a string from a file (correct)
  • To write a string to a file
  • To read a character from a file
  • To write an integer to a file

If you want to write an array to a file, which function could you use?

<p>fwrite (C)</p> Signup and view all the answers

What is required as a parameter when using fprintf?

<p>File pointer, format string, and values to write (C)</p> Signup and view all the answers

What will the following code do: size_t fwrite(arr, sizeof(arr), 1, fp);?

<p>It writes the entire arr to fp (C)</p> Signup and view all the answers

If the file pointer fp opens a file successfully, what does its value indicate?

<p>The file exists and is ready for operations (A)</p> Signup and view all the answers

What does the following structure define: struct record { char name; int roll; float marks; } student;?

<p>A single record of student details (D)</p> Signup and view all the answers

What is the return type of the fgetc function?

<p>int (D)</p> Signup and view all the answers

What does the putw function do?

<p>Writes an integer to a file (C)</p> Signup and view all the answers

When using fwrite, what does the second parameter represent?

<p>The size of the data type being written (A)</p> Signup and view all the answers

What type of variable is size_t defined as?

<p>unsigned int (D)</p> Signup and view all the answers

In the statement fprintf(fp, 'My age is %d', age);, what does %d signify?

<p>Displays a decimal number (C)</p> Signup and view all the answers

What can be concluded if fp is NULL after the fopen call?

<p>An error occurred when opening the file (C)</p> Signup and view all the answers

What does fgets return when it reaches the end of the file without reading any characters?

<p>NULL (B)</p> Signup and view all the answers

In the struct record, what data type is used for the marks field?

<p>float (D)</p> Signup and view all the answers

Which of the following correctly describes what the fgetc function returns?

<p>The next character from the specified file, or EOF on end of file. (B)</p> Signup and view all the answers

When using the fscanf function, which of the following would be incorrect?

<p>Providing an invalid format specifier. (A)</p> Signup and view all the answers

What is the role of the first parameter ptr in the fwrite function?

<p>It points to the data to be written to the file. (D)</p> Signup and view all the answers

What will happen if a file pointer fp is obtained successfully using fopen?

<p>The pointer will reference the opened file for reading/writing. (C)</p> Signup and view all the answers

In the declaration typedef unsigned int size_t;, what does size_t represent?

<p>An integer that can be used to represent memory sizes. (A)</p> Signup and view all the answers

When the statement putw(value, ptr); is executed, what happens?

<p>An integer value is written to the file. (A)</p> Signup and view all the answers

What is expected from the fgets function when it reaches the end of a file without reading any characters?

<p>It returns an empty string. (D)</p> Signup and view all the answers

Which of the following best describes what the struct record contains?

<p>It specifies a record type with fields for name, roll, and marks of a student. (B)</p> Signup and view all the answers

Is Egor gay?

<p>True (A)</p> Signup and view all the answers

Flashcards

fputc function

Writes a single character to a file.

fgetc function

Reads a single character from a file.

putw function

Writes an integer to a file.

getw function

Reads an integer from a file.

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fputs function

Writes a string to a file.

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fgets function

Reads a string from a file.

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fwrite function

Writes multiple data items to a file.

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fopen function

Opens a file for reading or writing.

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fscanf function

Reads formatted data from a file.

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What is 'FILE *fptr' used for?

It's a pointer to a FILE structure, which represents an open file. This pointer acts as a connection between your program and the file on the disk.

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Why use 'fopen'?

The fopen function is used to open a file for reading or writing. It creates a connection between your program and the file on the disk, ready for data transfer.

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What does 'fp==NULL' mean?

If fp (the file pointer) is assigned the value NULL, it indicates that the file could not be opened. This means there's an error, like the file not existing or insufficient permissions.

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What is 'exit(1)' used for?

The exit(1) function immediately stops the program's execution. It's commonly used after an error condition to prevent unexpected behavior.

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What's the purpose of 'fscanf'?

This function retrieves data from a file based on a specific format. It reads information according to the structure you define in the format string, like reading numbers or text.

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What is 'fprintf'?

This function writes formatted data to a file. It writes formatted data to a file, allowing you to control how numbers, strings, and other data are represented.

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What is 'fputc' used for?

It writes a single character to a file.

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What is 'fgetc' used for?

It reads a single character from a file.

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What is 'fwrite' used for?

It writes multiple data items to a file. It's like copying a whole document to the file.

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Study Notes

File Operations

  • Functions for file input/output (I/O) are described
  • Character I/O functions include fputc and fgetc
  • Integer I/O functions include putw and getw
  • String I/O functions include fputs and fgets
  • Formatted I/O functions include fprintf and fscanf
  • Block read/write functions include fwrite

Understanding fwrite()

  • A struct record is defined, holding data like name, roll, and marks
  • Program example shows how to use fwrite() to write data to a file

Randomly Accessing Files

  • fseek() function for moving the file pointer
  • Constants like SEEK_SET, SEEK_CURRENT, and SEEK_END control the origin of the displacement
  • ftell() to get the current file position
  • rewind() to move the file pointer to the beginning
  • perror() for error messages
  • rename(), unlink(), remove() for file management
  • fflush() to flush buffers

Temporary Files

  • tmpfile() creates a temporary file opened in "wb+" mode
  • tmpnam() generates a unique filename
  • freopen() associates a new file with a file pointer

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Description

This quiz covers essential file operations and I/O functions in C programming, including character, integer, string, and formatted I/O functions. It also explores file management functions, random access with fseek(), and temporary file handling using tmpfile(). Test your understanding of these critical concepts in file handling and manipulation.

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