lassie% ls
avg.c             max.c             print_cos_avg.c
dist.c            min.c             sum.c
main.c            mine.h            typescript
lassie% cat avg.c
#include "mine.h"

/* Function: avg
   Returns the average of x and y.
   Note: avg returns a *** double *** value.
*/
double avg (int x, int y) {
   double average ;
   
   average = (x + y) / 2.0 ;
   return (average) ;
}
lassie%

lassie% cat print_cos_avg.c
#include <stdio.h>
#include "math.h"
#include "mine.h"

#define PI 3.14159

/* Function: print_cos_avg
   Print the cosine of the average
   of x and y.
*/
void print_cos_avg (int x, int y) {
   double average ;

   average = avg(x,y) ;
   printf("Cosine of the average of %d and %d: %f\n",
      x, y, cos(PI * average / 180.0) ) ;
}
lassie% 


lassie% cc201 -c avg.c dist.c max.c min.c print_cos_avg.c sum.c
avg.c:
dist.c:
max.c:
min.c:
print_cos_avg.c:
sum.c:
lassie% 

lassie% ls
avg.c             main.c            min.o             sum.c
avg.o             max.c             mine.h            sum.o
dist.c            max.o             print_cos_avg.c   typescript
dist.o            min.c             print_cos_avg.o
lassie% 

lassie% ar -qv libmine.a avg.o dist.o max.o min.o print_cos_avg.o sum.o
q - avg.o
q - dist.o
q - max.o
q - min.o
q - print_cos_avg.o
q - sum.o
ar: Warning: creating libmine.a
s - creating symbol hash table. Wait...
s - done
lassie% 

lassie% ls
avg.c             libmine.a         min.c             print_cos_avg.o
avg.o             main.c            min.o             sum.c
dist.c            max.c             mine.h            sum.o
dist.o            max.o             print_cos_avg.c   typescript
lassie% 

lassie% ar -t libmine.a
avg.o
dist.o
max.o
min.o
print_cos_avg.o
sum.o
lassie% 

lassie% cc201 main.c -L . -lmine
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% exit
lassie% 
script done on Tue Oct 25 09:27:56 1994