You are not doing decimal math, but binary math. Perhaps the following will help you understand.

#!usr/bin/perl
print " This program will print all 10 decimal places.\n";
print "Enter an integer value.\n";
$value =<STDIN>;
#$value=1;
#chop($value);
$a = $value+1;
print "$a\n";
while ($value<$a) {
        print "value has become $value\n";
        $value=$value+0.1;
        print "Value after increment is :".sprintf('%20.17f',$value)."
+\n"
}
print "EOF.\n";
[download]

result

 This program will print all 10 decimal places.
Enter an integer value.
10
11
value has become 10

Value after increment is :10.10000000000000000
value has become 10.1
Value after increment is :10.19999999999999900
value has become 10.2
Value after increment is :10.29999999999999900
value has become 10.3
Value after increment is :10.39999999999999900
value has become 10.4
Value after increment is :10.49999999999999800
value has become 10.5
Value after increment is :10.59999999999999800
value has become 10.6
Value after increment is :10.69999999999999800
value has become 10.7
Value after increment is :10.79999999999999700
value has become 10.8
Value after increment is :10.89999999999999700
value has become 10.9
Value after increment is :10.99999999999999600
value has become 11
Value after increment is :11.09999999999999600
EOF.
[download]

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