File Handling Concepts Quiz
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Questions and Answers

What are the two main categories of files mentioned in the content?

  • Binary files and text files (correct)
  • Text files and image files
  • Binary files and executable files
  • Executable files and image files

    • What is the primary purpose of 'writing' in relation to files mentioned in the content?

  • To compress a file
  • To store data (correct)
  • To execute a program
  • To display an image

    • What is the difference between 'writing' for text files and 'writing' for binary files, as described in the content?

  • Text files are easier to edit than binary files
  • Text files store data in a human-readable format, while binary files store data in a machine-readable format (correct)
  • Text files require special encoding, while binary files don't
  • Binary files are larger than text files

    • Which of these activities would involve the use of 'reading' for a text file? (Select all that apply)

    <p>Viewing a document in a word processor (D)</p> Signup and view all the answers

    Based on the provided content, which of these combinations suggests a typical workflow involving files?

    <p>Writing to a text file, reading from a text file (D)</p> Signup and view all the answers

    What mode would you use if you wanted to both read and write to a file, but only if the file already exists?

    <p>'r+' (A)</p> Signup and view all the answers

    Which mode is specifically designed to append data to a file, creating a new file if it doesn't exist?

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

    In the provided content, what happens when the 'w' mode is used to open a file that already exists?

    <p>The existing file is overwritten with new content. (C)</p> Signup and view all the answers

    What is the purpose of the fclose() function in the provided code?

    <p>To close a file that was opened previously. (C)</p> Signup and view all the answers

    What mode would you use to create a new file, preventing the program from overwriting an existing file with the same name?

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

    In the provided code, what would happen if you wanted to read data from a file named "data.txt" and then append additional data to the same file?

    <p>You would use the 'r+' mode to open the file for both reading and writing. (C)</p> Signup and view all the answers

    Which mode is best suited for editing an existing file with the ability to read, modify, and write back to the same file?

    <p>'r+' (A)</p> Signup and view all the answers

    If you were to open a file for reading using the 'r' mode, but the file doesn't exist, how would the program typically respond?

    <p>It will encounter an error and likely terminate. (A)</p> Signup and view all the answers

    Which of the following modes can be used to create a new file if it doesn't exist and overwrite it if it does exist?

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

    Let's say you want to modify only a specific section of an existing text file, without affecting the rest of the file. Which of the following modes would be the most appropriate?

    <p>'r+' (A)</p> Signup and view all the answers

    What is the primary purpose of the 'FILE *' type variable in the code?

    <p>To represent a file that has been opened, allowing access to its data. (A)</p> Signup and view all the answers

    Which of these options would you likely use to create a new file using the 'FILE *' variable?

    <p>FILE *fp = fopen(&quot;new_file.txt&quot;, &quot;w&quot;); (A)</p> Signup and view all the answers

    What does the code snippet FILE *fp = fopen("existing_file.txt", "r"); do?

    <p>Opens an existing file named &quot;existing_file.txt&quot; for reading, and allows access to its contents for reading. (B)</p> Signup and view all the answers

    Which of these function calls would be most likely used to close a file previously opened using FILE *fp = fopen("my_file.txt", "w");?

    <p>fclose(fp); (A)</p> Signup and view all the answers

    In the context of file handling, what is the function fopen() primarily used for?

    <p>Opening a file for reading or writing, providing a pointer to the file. (C)</p> Signup and view all the answers

    Signup and view all the answers

    Study Notes

    File Handling in C

    • C offers two types of data files: stream-oriented and system-oriented.
    • Stream-oriented files can be text files (consecutive characters) or unformatted files (consecutive bytes).
    • System-oriented files are closely related to the operating system.
    • A file pointer is a pointer to information about a file (name, status, current position).
    • It's a FILE type pointer variable, declared in stdio.h.
    • File pointers can be declared as FILE *fp;.
    • Opening a file requires specifying the file name and mode (e.g., reading, writing).
    • The fopen() function is used to open a stream and link it to the file.

    File Modes

    • r: Opens an existing file for reading. Returns NULL if the file doesn't exist.
    • w: Creates a new file for writing. Overwrites the file if it already exists.
    • a: Opens a file for appending. Appends to the end of the file if it exists; creates a new file if not.
    • r+, w+, a+: Open files for both reading and writing.

    File Operations using Functions

    • fopen(): Creates a new file for read/write.
    • fclose(): Closes a file associated with a file pointer.
    • closeall(): Closes all files opened by fopen().
    • fgetc()/getc(): Reads a character from the current position and moves the pointer.
    • fprintf(): Writes various data types to a file.
    • fscanf(): Reads various data types from a file.
    • fputc(): Writes a character to a file.
    • fputs(): Writes a string to a file.
    • fgets(): Reads a string from a file.
    • fread(): Reads structured data from a file.
    • fwrite(): Writes structured data to a file.
    • fseek(): Sets a file pointer's position.
    • feof(): Checks for end-of-file.
    • ferror(): Reports read/write errors.
    • ftell(): Returns the current file position.
    • rewind(): Positions the file pointer to the beginning.
    • rename(): Changes a file's name.

    File Types

    • Files can be sequential or random access.
    • Sequential files access records in order.
    • Random access files allow direct access to any record.

    File Input/Output

    • Reading and writing to files is done using standard I/O functions.

    Data Types

    • File handling operations use various data types, like integers, floating-point numbers, and strings.

    Preprocessor Directives (#define, #include, #error)

    • Preprocessor directives are instructions to the preprocessor, which modifies the program before compilation.
    • #define creates symbolic names (e.g., #define PI 3.14).
    • #include inserts header files (e.g., #include <stdio.h>).
    • #error displays a given message during compilation (used for errors).

    Conditional Compilation

    • Conditional compilation directives (e.g., #ifdef, #else, #endif) allow sections of code to be included or excluded based on predefined symbols.

    Predefined Macros

    • Predefined macros in ctype.h are used for character and string tests and conversions.

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    Related Documents

    File Handling Notes PDF

    Description

    Test your knowledge on file handling concepts, including the main categories of files, the purpose of writing, and the differences between text and binary file operations. This quiz covers key activities such as reading and writing for files, helping you solidify your understanding of file workflows.

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