Checking whether a file exists or not is a common task in programming, especially when working with files and directories. In the C programming language, there are several approaches to accomplish this task. One common approach is to use the `access()` function, which takes two arguments: the path to the file and a mode indicating the desired access permissions.
The `access()` function returns 0 if the file exists and the specified permissions are granted, or -1 if the file does not exist or the permissions are denied. Here’s an example of using the `access()` function to check if a file exists:
