Podcast
Questions and Answers
What is FILE in C capable of holding?
What is FILE in C capable of holding?
- Only data read from the file
- Only file names
- All information needed to control a C I/O stream (correct)
- Only data written to the file
What happens when a file is opened in read mode?
What happens when a file is opened in read mode?
- The file is used to read in data (correct)
- The file is created if it does not exist
- The file is opened for appending
- The file is opened for writing
In which mode should a file be opened to append information to the end of an existing file?
In which mode should a file be opened to append information to the end of an existing file?
- Read mode
- Create mode
- Append mode (correct)
- Write mode
What are the two types of file I/O methods considered in the lecture?
What are the two types of file I/O methods considered in the lecture?
What must be done before any I/O operations on a file can be performed?
What must be done before any I/O operations on a file can be performed?
FILE is a predefined object type in C for file I/O operations
FILE is a predefined object type in C for file I/O operations
The file descriptors are used in low-level I/O in C
The file descriptors are used in low-level I/O in C
When a file is opened in read mode, the system creates the file if it does not exist
When a file is opened in read mode, the system creates the file if it does not exist
FILE * stdin is given to fgets to read input from the standard input
FILE * stdin is given to fgets to read input from the standard input
To append information to the end of an existing file, the file should be opened in append mode
To append information to the end of an existing file, the file should be opened in append mode
Study Notes
FILE Object in C
FILEis a predefined object type in C specifically designed for file Input/Output (I/O) operations.- It can hold information related to a file, such as its current position, mode (read, write, append), and end-of-file indicators.
File Opening Modes
- Opening a file in read mode allows for reading the file's content. If the file does not exist, the system will not create it, which could lead to an error if a read operation is attempted.
- To append information to an existing file, the file must be opened in append mode, ensuring that new data is added to the end without altering existing content.
File I/O Methods
- Two types of file I/O methods are considered: high-level and low-level I/O.
- High-level I/O typically uses
FILEobjects and functions likefopen,fread,fprintf, while low-level I/O uses file descriptors and system calls such asopen,read, andwrite.
File Operations Preparation
- Before performing any I/O operations on a file, it is essential to open the file using appropriate modes, establishing the context for subsequent operations.
Standard Input
- The standard input stream (
stdin) can be accessed usingFILE * stdin, which is utilized by functions likefgetsto read input from the console or user input source.
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Description
Test your knowledge on file input/output (I/O), system calls, and the C library with this quiz based on CMPT 214 Lecture 20. Explore topics such as file stream I/O, file descriptors, and the FILE * object type.
