File I/O is essential for reading and writing data from "summary" of C Programming Language by Brian W. Kernighan,Dennis Ritchie
File I/O is essential for reading and writing data. In C, input and output are performed through streams of data, which are sequences of characters. These streams can be connected to the terminal, a disk file, or another device. To read data from a file, we need to open the file first using the `fopen` function. This function takes two arguments - the name of the file and the mode in which the file should be opened. The mode can be "r" for reading, "w" for writing, or "a" for appending to the end of the file. Once the file is opened, we can use functions like `fgetc` or `fgets` to read data from the file character by character or line by line. After we are done reading from the file, we need to close it using the `fclose` function to release the resources associated with the file. Similarly, to write data to a file, we need to open the file in write mode using the `fopen` function with the "w" mode. We can then use functions like `fputc` or `fputs` to write data to the file character by character or line by line. Again, we need to close the file using the `fclose` function when we are done writing to it. File I/O allows us to store data persistently on disk, retrieve it when needed, and manipulate it in various ways. It is an essential aspect of programming in C as it enables us to work with external data sources and interact with the user through input and output operations. Understanding how to read from and write to files is crucial for developing applications that deal with large amounts of data or need to save user-generated content for future use.
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