You could just use it as is. 
$ perl -le'print "1.12345E+05" - 100000'
12345

[download]

All your work is equivalent to adding zero to the arg. 

$ perl -le'print 0+"1.12345E+05"'
112345

[download]

In reply to Re: Conversion from Scientific Notation by ikegami
in thread Conversion from Scientific Notation by Zaserov

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