If you create a text file x.txt with following data 
227.20
1176.00
262.00
481.60
492.00
489.60
808.50
934.50
150.00
806.00
563.70
295.60
552.90
327.25
0.00
0.00
0.00

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Then file x2.txt 
7566.85

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And then run this code 
open (X,"< x.txt");
while ($n = <X>) {
    $n =~ s/\n|\r//g;   # same with or without
    $t += $n;
}
close X;
$st = `cat x2.txt`;
$st =~ s/\n|\r//g;  # same with or without
print "t  = $t\n";
print "st = $st\n";

if (equal($t,$st,5)) {
    print "Equal\n";
} else {
    print "Different\n";
}

sub equal {
    my ($A,$B,$dp) = @_;

    return sprintf("%.${dp}g",$A) eq sprintf("%.${dp}g",$B);
}

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The result is 
t  = 7566.85
st = 7566.85
Different

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So the only reliable solution I have found till now is 
sub equal {
    my ($A,$B,$dp) = @_;

    if ($A == $B) {
        return 1;
    } elsif ($A eq $B) {
        return 1;
    }
    return sprintf("%.${dp}g",$A) eq sprintf("%.${dp}g",$B);
}

[download]
Result 
t  = 7566.85
st = 7566.85
Equal

[download]

In reply to Re: My floating point comparison does not work. Why ? by hanspr
in thread My floating point comparison does not work. Why ? by thens

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