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$number = 12650 / 10000;
$dp = 2;
...
print "val2 = val1 + 0.5 = $val2\n";
print "val3 = int(val2) = $val3\n";
print "val4 = val3 / exp = $val4\n";

Actual: 1.265
val1 = value x exp = 126.5
val2 = val1 + 0.5 = 127
val3 = int(val2) = 126
val4 = val3 / exp = 1.26