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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 fil...
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    C Programming Language

    Brian W. Kernighan

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