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Re: Comparing results of math operations

by zentara (Archbishop)
on Apr 16, 2014 at 09:50 UTC ( #1082474=note: print w/replies, xml ) Need Help??


in reply to Comparing results of math operations

Here is another textbook example which demonstrates the problem. You need to specify how many digits of accuracy you need for the comparison, and round your floats off accordingly.
#!/usr/bin/perl -w use strict; my ( $number, $premium, $expected ); $number = 1.80; $premium = $number * ( 1 + 10/100 ); # 1.8 + 10% of 1.8 $expected = 1.98; # As we know 1.8 + 10% of 1.8 is 1.98 printf "Number 1 : %20.19f\n", $premium ; printf "Number 2 : %20.19f\n", $expected ; print "Not" if ( $expected != $premium ); print "Equal !! "; __END__ Number 1 : 1.9800000000000002043 Number 2 : 1.9799999999999999822 NotEqual !!

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