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preventing real no. "1.30"  to "1.2999999999"

Posted on 1999-07-21
Medium Priority
Last Modified: 2010-04-04
how can i get a real number without changing
its digits ex.
having a number "1.30" (string);
and "realno" variable of type real;

 realno := strtofloat("1.30");

 1.2999999999 inside realno..

 how to prevent it and the output will be exactly
Question by:mvalez
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Accepted Solution

rwilson032697 earned 0 total points
ID: 1390328
You can't (unless you use something like BCD).

This is caused by the imprecise representation of many real numbers by the floating point types.

To get 1.3 back again jut convert it to a string with the same number of decimal places, eg:

RealStr := format('%.1f', [realno]);




Expert Comment

ID: 1390329
Hi, Mvalez...

try this:


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