Thread: Passing data/pointers between functions

I have just started working with functions. I am trying to clarify how to pass data between these functions without declaring global variables. I am also trying to discover how to pass file pointers between functions.

IE:

The code I attached below opnes 3 files. If I wanted to open these 3 files in a separte function (say will call it "open_files).

In the stock_report function, I want to call the open files function. How do I pass the file pointer into the stock_report function so that I can use the open_files function?


This progam has 2 input files but I could not figure out how to attach more than 1 file to this post.

Thanks again as always,
Alan

I have a great function you can use to open file! It's called, conveniently enough, "fopen()"! It works wonders. Alternately, at a bit more low level, you could just call "open"...

How to pass a file pointer:

void myfun( FILE *fp )
{
...do stuff...
}

Called like:

myfun( myFilePointer );


How to return a file pointer:

FILE *myfun( ...something or nothing... )
{
...do stuff...
}

Called like:

fp = myfun( ...something or nothing... );

What's not to know?

Quzah.