HI bbcnews, 

Thanks for your reply. I have compiled all the individual files with -c  command and then used ifort *.o -o program then the program is created. However, when I try to run the program it gives the error "

forttl : No such file or directory
fortt1 : severed (29): file not found, unit 1

Acutally I have the input file on the same folder. I don't know why I am getting such error ? Any help is appeciated. 

Thanks.

Anjeep