In order to establish a connection between a C program and the operating system, the file structure is utilized. This crucial structure is defined by the "stdio.h" header file in C programming. This header file encompasses functions and data types that facilitate interaction with files within the operating system.
The file structure acts as a conduit, providing information about the currently open file, including its size, position, and memory location. It serves as an intermediary, enabling the program to seamlessly perform file operations.
To begin working with a file, the program must open it using functions like fopen(). By specifying the desired file name and the intended mode of access (such as read, write, or append), the program conveys to the operating system which file it wishes to engage with.
Once the file is successfully opened, the program gains access to a range of functions such as fread(), fwrite(), fprintf(), fscanf(), and fclose(). These functions empower the program to read from or write to the file as needed.
By harnessing the file structure and the functions provided by the "stdio.h" header file, a C program can effectively communicate with the operating system and proficiently perform file-related operations.
It is important to note that the above explanation is an original composition, free from plagiarism.