> Can we write a loop to run the simulation from 1 to 19 express cashiers
> instead of having to read in from standard input for 19 times for each
> different mean interarrival times? And another loop for the 3 different
> interarrival times?

I would rather you avoided changing the input format since the markers
might decide to use a script to test all your solutions.  You could
either used a loop in your shell (lookup the 'foreach' command in any
C shell documentation), or you could create a shell script to do
this.

Actually, I think I'll provide one for you.  Cut the following text
and paste it into a text file called 'run_loop' in your assignment
directory.  This is a Bourne shell script.  You have to make the file
an executable by issuing 'chmod +x run_loop' (without the quotes) in
the assignment directory.  After this you can run your solution with
all 19 possible express cashier counts using something like 'run_loop
100 1200 1 1'.  If you want you can display the output one page at a
time using something like 'run_loop 100 1200 1 1 | more'.  You can
also redirect the output to a file using something like ''run_loop 100
1200 1 1 > output_file'.

Depending on your environment setup, you might have to replace
'run_loop' with './run_loop'.

Carl.

----------- cut here ------------
#!/bin/sh

if [ $# != 4 ]
then
    echo "Usage: run_loop <report interval> <endingtime> <seed1> <seed2>"
    echo "example: run_loop 100 1200 1 1"
    exit 1
fi

rep_interval=$1
end_time=$2
seed1=$3
seed2=$4

num_express=1

while [ "$num_express" -lt 20 ]
do
    input="$rep_interval $end_time $seed1 $seed2 $num_express"
    echo "Output resulting from input = '$input':"
    echo
    echo "$input" | ./supermarket
    echo; echo; echo

    num_express=`expr $num_express + 1`
done
-------------- end ----------------