3**(6-1*4)**2 is a bad test since (3**2)**2 happens to equal 3**(2**2)

When I use the 3**4**2 I had previously mentioned, your code returns 6561 ((3**4)**2) instead of 43046721 (3**(4**2)). 

>perl -le"print 3**4**2"
43046721

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In reply to Re^3: a timid approach to parsing arithmetic expressions in perl by ikegami
in thread a timid approach to parsing arithmetic expressions in perl by spx2

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