combining two c code file

how can i combine two c code file . i used keil and both of the file is run properly but i need both this file in single c file.please replay fast
here is my code

It is difficult to merge these sources. You need to do a full rewrite of the code to make thing working. Like instead of reading data in while(1) of main from gsm.txt put the logic in interrupt and rest of the code from lm35.txt you can arrange in while(1). Take lm35 code as base and merge code from gsm.txt in the base code. It will be easier.

Thank you ajay_bhargav