Memory Related questions in C language Programming

I develap a draughting software in c language but it donot clear RAM mempry after completing execution. Pls suggest me memory clearing statements in c Language......

Thanks in Advance

wrong section there is a programing thread.

Here is a hint:
C does not inherently have this facility there are four library routines which allow this function. There is no garbage collector in C.

Google is your friend do a search for "malloc" that should help you out.