tomipooh@joho01-itpass:~$ ./quiz2.sh 1234
1234
1 + 2 + 3 + 4
1 * 2 * 3 + 4
(1 + 2) + 3 + 4
(1 * 2) * 3 + 4
1 + (2 + 3) + 4
1 * (2 * 3) + 4
1 + 2 + (3 + 4)
(1 + 2 + 3) + 4
(1 * 2 * 3) + 4
1 + (2 + 3 + 4)
1 * (2 * 3 + 4)
(1 + 2) + (3 + 4)
tomipooh@joho01-itpass:~$ ./quiz2.sh 12345
12345
the number should be four-digits.
tomipooh@joho01-itpass:~$ ./quiz2.sh 123
123
the number should be four-digits.
tomipooh@joho01-itpass:~$ ./quiz2.sh 432
432
the number should be four-digits.
tomipooh@joho01-itpass:~$ ./quiz2.sh 0432
0432
0 + 4 + 3 * 2
0 + 4 * 3 - 2
(0 + 4) + 3 * 2
(0 + 4) * 3 - 2
0 + (4 * 3) - 2
0 + 4 + (3 * 2)
(0 + 4 * 3) - 2
0 + (4 + 3 * 2)
0 + (4 * 3 - 2)
(0 + 4) + (3 * 2)