The C standard library provides essential functions for input/output from "summary" of C Programming Language by Brian W. Kernighan,Dennis Ritchie
The C standard library includes a wide array of functions that are essential for input and output operations in a C program. These functions are designed to allow the program to interact with the user, as well as with external devices such as files and networks. Input functions are used to read data from the user or from a file, while output functions are used to display information to the user or write data to a file. One of the most basic input functions is scanf, which is used to read input from the standard input stream. It allows the program to accept input from the user via the keyboard. Similarly, the fscanf function is used to read input from a file, allowing the program to retrieve data from external sources. On the other hand, the most basic output function is printf, which is used to display output to the standard output stream. It allows the program to show information to the user on the screen. Similarly, the fprintf function is used to write output to a file, enabling the program to store data in external storage. In addition to these basic input and output functions, the C standard library also includes functions for more advanced input and output operations. For example, the getchar function is used to read a single character from the standard input stream, while the putchar function is used to display a single character to the standard output stream. Furthermore, the C standard library provides functions for handling formatted input and output. For instance, the sprintf function is used to write formatted data to a string, while the sscanf function is used to read formatted data from a string. These functions allow the program to manipulate data in a structured manner.- The functions provided by the C standard library for input and output operations are essential for the proper functioning of a C program. They enable the program to interact with the user and external devices, as well as to manipulate data in a structured manner.
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