C Programming File I/O Quiz

<p>They are used for reading and writing integers only. (C)</p> Signup and view all the answers

<p>Data may be lost because it won't be written to the disk. (D)</p> Signup and view all the answers

<p>The output format for the data being written (A)</p> Signup and view all the answers

<p>By using the getw function (A)</p> Signup and view all the answers

<p>To write a character to a file (A)</p> Signup and view all the answers

<p>Data handling is time consuming and cumbersome. (A)</p> Signup and view all the answers

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

<p>Creates a new file for use. (B)</p> Signup and view all the answers

<p>File name, data structure, and purpose. (C)</p> Signup and view all the answers

<p>FILE *fp; (C)</p> Signup and view all the answers

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

<p>Writes a set of data values to a file. (A)</p> Signup and view all the answers

<p>The purpose of opening the file. (C)</p> Signup and view all the answers

<p>Open the file for reading only. (A)</p> Signup and view all the answers

<p>Outstanding data may not be flushed from buffers. (A)</p> Signup and view all the answers

<p>Writes a character to a file pointed by fp1. (C)</p> Signup and view all the answers

<p>The file exists but cannot be overwritten. (A)</p> Signup and view all the answers

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

<p>Opening a file as read-only and writing to it (A), Reading beyond end-of-file marker (B)</p> Signup and view all the answers

<p>An end-of-file marker (EOF). (B)</p> Signup and view all the answers

<p>fclose(file_pointer); (C)</p> Signup and view all the answers

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

<p>The file is created. (B)</p> Signup and view all the answers

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

<p>To prevent accidental misuse of the file. (C)</p> Signup and view all the answers

<p>Check for reasons why the file could not be opened. (A)</p> Signup and view all the answers

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

<p>It prints 'End of data.' if all data has been read from the file. (C)</p> Signup and view all the answers

<p>The program may terminate prematurely. (D)</p> Signup and view all the answers

<p>To save the current position of the file. (B)</p> Signup and view all the answers

<p>It helps to read the file more than once. (A)</p> Signup and view all the answers

<p>fseek(fp, offset, position); (A)</p> Signup and view all the answers

<p>The beginning of the file. (D)</p> Signup and view all the answers

<p>It moves the pointer backwards in the file. (B)</p> Signup and view all the answers

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

<p>It can move the file pointer to any location based on specified criteria. (D)</p> Signup and view all the answers

<p>Keeps the pointer at its current position. (B)</p> Signup and view all the answers

A file is a location on a disk where a group of related data is stored.

File operations allow you to interact with files, enabling actions like creating, opening, reading, writing, and closing files.

The fopen() function is used to open or create a file, making it accessible for use by your C program.

The fclose() function closes a file that was previously opened with fopen(), releasing the connection and resources.

The FILE* data type is used to represent a file in your program. It establishes a link between your program and the actual file system.

The filename specifies the name of the file you want to access. It's how your program identifies the target file.

The mode defines how you intend to use the file. Common modes include "r" for reading, "w" for writing, and "a" for appending.

The fp variable, declared as a FILE* pointer, stores the identifier assigned by the operating system when you open a file. It acts as a communication link between your program and the system.

The file is opened for reading only. If the file doesn't exist, the function returns NULL.

The file is opened for writing only. If the file doesn't exist, it is created. If the file exists, its contents are overwritten.

The file is opened for appending data. If the file doesn't exist, it is created. New data is added to the end of the file without overwriting existing content.

The fclose() function is used to close a file that was previously opened with fopen(). This releases the file resources and prevents accidental misuse.

A FILE pointer is a special variable in C that stores information about a file, allowing the program to interact with it.

The getc() function is used to read a single character from a file that is opened in read mode.

The putc() function is used to write a single character to a file that is opened in write or append mode.

After each getc or putc operation, the file pointer is moved to the next character position in the file.

The fprintf function writes formatted data to a file. It takes a file pointer, a format string, and a list of arguments to be written.

The fscanf function reads formatted data from a file. It takes a file pointer, a format string, and a list of addresses to store the read data.

An error may occur during file input/output (I/O) operations. These errors are detected and handled to prevent program crashes.

The feof function tests for the end-of-file condition. It returns a non-zero value if the end of the file has been reached, otherwise zero.

The ferror function reports the error status of a file. It returns a non-zero value if an error has occurred during file processing, otherwise zero.

If a file cannot be opened, the fopen function returns a NULL pointer. This indicates an unsuccessful file opening attempt.

The EOF (End of File) marker is a special character that signals the end of a data stream. It's used to indicate that there is no more data to be read from a file.

The getc(fp) function is used to read a single character from a file. It takes a file pointer (fp) as input and returns the character read as an integer.

The putc(c, fp) function writes a single character (c) to a file. It takes the character and a file pointer (fp) as input.

The fopen(filename, mode) function opens a file for reading or writing. It takes the file name and the desired mode as input. The mode can be "r" for read, "w" for write, or "a" for append. It returns a FILE pointer if successful, and NULL if unsuccessful.

The fclose(fp) function closes a file that was previously opened using the fopen() function. It releases the file resources, ensuring proper cleanup.

The getw(fp) function reads an integer value from a file. It takes the file pointer (fp) as input.

The putw(integer, fp) function writes an integer value to a file. It takes the integer value and a file pointer (fp) as input.

The fprintf(fp, "format string", values) function writes formatted data to a file. It's similar to printf(), but it writes to a file instead of the console.

A function that retrieves the current position of the file pointer within a file, measured in bytes from the beginning of the file. It returns a long integer representing this position.

A function that sets the file pointer to the beginning of the file. It allows rereading the file from the start without closing and reopening it.

A function that repositions the file pointer to a specific location within the file, based on an offset and a reference point. It supports moving forward or backward within the file.

Reference point for the 'fseek' function. It indicates whether the offset is calculated from the beginning, the current position, or the end of the file.

A long integer value representing the offset to move the file pointer from the reference point. It can be positive (move forward) or negative (move backward).

A function that closes a file, releasing the connection and resources. It's essential to close files to ensure data integrity and prevent leaks.

A mode used in the 'fopen' function for reading from a file. It's used to read data from a file.

A mode used in the 'fopen' function for writing to a file. It's used to write data into a file. It overwrites the existing contents of the file if it already exists.