lassie% ls
big.c      hello.c    inc.txt    inc2.c     print.c    sep1.c
big.txt    hello.txt  inc1.c     mine.h     sep.txt    sep2.c
lassie%

lassie% cc201 -c sep1.c
lassie% cc201 -c sep2.c
lassie%

lassie% ls
big.c       hello.txt   inc2.c      sep.txt     sep2.c
big.txt     inc.txt     mine.h      sep1.c      sep2.o
hello.c     inc1.c      print.c     sep1.o
lassie%

lassie% cc201 sep1.o sep2.o
lassie% ls
a.out*      hello.c     inc1.c      print.c     sep1.o
big.c       hello.txt   inc2.c      sep.txt     sep2.c
big.txt     inc.txt     mine.h      sep1.c      sep2.o
lassie%

lassie% a.out
Enter first number: 30
Enter second number: 60

The sum of 30 and 60 is: 90
The smaller of 30 and 60 is: 30
The larger of 30 and 60 is: 60
The average of 30 and 60 is: 45.000000
The distance between 30 and 60 is: 30
Cosine of the average of 30 and 60: 0.707107
That's all folks.
lassie%