write two different files using same function

[1vf9z8AR]

I cant understand how to create a function named 'write(filename)' which lets the user write into the file named file1 or file2.

my main would be something like
write(file1);
write(file2);

[coder777]

A function that takes a parameter for the file name may look like this:

void write(const char *filename); // Prototype

...

void write(const char *filename)
{
...
}