# Run:
# perl calculator1.pl tests
# perl calculator2.pl tests
2
-2--4
2 * 4
2 * 4 + 6
2 + 4 * 6 + 1
2 * 3 + 4 - 5 * 6
2 + (4 + 6) * 8
(((2 + (((4 + (6))) * (8)))))
2 ^ 3 ^ 2
2 ^ (3 ^ 2)
(2 ^ 3) ^ 2
2 * 2^3^2
(2^5)^2
2^5^2
0*1/(2+3)-4^5
2/3+1
# Run:
# perl calculator1.pl tests
# perl calculator2.pl tests
2
-2--4
2 * 4
2 * 4 + 6
2 + 4 * 6 + 1
2 * 3 + 4 - 5 * 6
2 + (4 + 6) * 8
(((2 + (((4 + (6))) * (8)))))
2 ^ 3 ^ 2
2 ^ (3 ^ 2)
(2 ^ 3) ^ 2
2 * 2^3^2
(2^5)^2
2^5^2
0*1/(2+3)-4^5
2/3+1