Thread: Program that displays amount of free memory

HI
I would like to somthing like free function that displays amount of free memory in linux, so I want to write a program that displays amount of free memory on the system, so I suppose I have to use a function or something that displays memory data. It's not useful to type free -m to display amount of free memory, I need to have displayed amount of free memory at begining or end of some program........like...... amount of free memory = 480MB
and then program runs forward. I know I described weird - the point is I need a line in program or program that tells to the system to display amount of free memory on the screen .
Have a nice Day

Matt