File Writing in C and C++ Quiz
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Questions and Answers

Which function is used to read a single character from a file in C?

  • fgetc() (correct)
  • fgets()
  • fscanf()
  • fread()

    • What is the purpose of the Destination_addr parameter in the fread() function?

  • It specifies the logical file name from which the data will be read.
  • It specifies the location where the data will be written.
  • It specifies the number of bytes to be read.
  • It specifies the first address of the memory block where the data will be read. (correct)

    • Which function should be used to read a string from a file in C?

  • fscanf()
  • fread()
  • fgetc()
  • fgets() (correct)

    • What is the purpose of the Size parameter in the fread() function?

    <p>It specifies the number of bytes to be read. (D)</p> Signup and view all the answers

    Which function should be used to read formatted data from a file in C?

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

    What is the purpose of the conversion specifiers parameter in the fscanf() function?

    <p>It specifies the format in which the data should be read. (A)</p> Signup and view all the answers

    Which function should be used to write data to a file in C?

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

    What is the purpose of the Source_addr parameter in the fwrite() function?

    <p>It specifies the first address of the memory block from which the data will be written. (D)</p> Signup and view all the answers

    Which function is used to read a line of text from a file in C?

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

    What happens if a file is not closed in a C program?

    <p>The operating system will close the file at the end of program execution. (B)</p> Signup and view all the answers

    Study Notes

    File Input/Output in C

    • Source_addr is the first address of the memory block where the data to be written is stored.
    • Size is the number of bytes to be written.

    Writing to Files in C

    • fopen is used to open a file in write mode.
    • fwrite is used to write data to a file.
    • fclose is used to close the file after writing.

    Reading from Files in C

    • fopen is used to open a file in read mode.
    • fread is used to read data from a file.
    • fclose is used to close the file after reading.
    • Methods to read from files:
      • fgetc to read a single character.
      • fgets to read a string.
      • fscanf to read formatted data.
      • fread to read a block of data.

    Sample Programs in C

    • Program to display the contents of a file on the screen:
      • Open the file for input.
      • Read characters from the file using fgetc.
      • Write the characters to the screen using printf.
      • Close the file.
    • Program to read from a file until the end of file:
      • Open the file for input.
      • Use a while loop to read from the file until feof returns true.
      • Use fread to read a struct from the file.
      • Print the struct data to the screen using printf.
      • Close the file.

    Full Methods

    • writeC(): asks the user to enter a character, writes it to a file, and closes the file.
    • readC(): opens a file, reads a character from the file, prints it to the screen, and closes the file.
    • writeS(): asks the user to enter a string, writes it to a file, and closes the file.
    • readS(): opens a file, reads a string from the file, prints it to the screen, and closes the file.

    Opening and Closing Files

    • If a file is not closed in the program, the operating system closes it at the end of the program execution.
    • However, if the program terminates abnormally, data may be lost.

    Reading and Writing

    • Read(Source_file, Destination_addr, Size): reads data from a file.
    • Write(Destination_file, Source_addr, Size): writes data to a file.

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    Description

    Test your knowledge of writing to files in C and C++, including detecting the end of a file and working with standard I/O devices. This quiz covers concepts such as logical file names, sample programs in C, and algorithms for displaying file contents on the screen.

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