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POComparing two "Double" variables with -eq/-ne does not validate if number is creater than 2 digits
 

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  1. POComparing two "Double" variables with -eq/-ne does not validate if number is creater than 2 digits
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    <p>Im trying to compare two <code>Double</code> variables in <code>Powershell</code>. When the variable is over 2 digits (not counting precision) the equality test fails unexpectedly. </p> <p>Am I missing something obvious here?</p> <p>Here is the test script output:</p> <pre><code>PS C:\test&gt; .\test.ps1 ========== TEST ONE ========== Value of Double1: 336.1 Type of Double1: System.Double ----- Value of Double2: 336.2 Type of Double2: System.Double ----- Value of Double1+.1: 336.2 Type of Double1+.1: System.Double ----- Does Double1 not equal Double2: True Does Double1+.1 not equal Double2: True ========== TEST TWO ========== Value of Double3: 36.1 Type of Double3: System.Double ----- Value of Double4: 36.2 Type of Double4: System.Double ----- Value of Double3+.1: 36.2 Type of Double3+.1: System.Double ----- Does Double3 not equal Double4: True Does Double3+.1 not equal Double4: False </code></pre> <p>And here is the test script, notice the first test fails the test where I add .1 to the variable, but the second test passes.</p> <pre><code>################################## # START TEST ################################## $Double1 = 336.1 $Double2 = 336.2 write-host "==========" write-host "TEST ONE" write-host "==========" write-host "Value of Double1: $Double1" write-host "Type of Double1:" $Double1.GetType().FullName write-host "-----" write-host "Value of Double2: $Double2" write-host "Type of Double2:" $Double2.GetType().FullName write-host "-----" write-host "Value of Double1+.1:" ($Double1+.1) write-host "-----" write-host "Does Double1 not equal Double2:" ($Double1 -ne $Double2) write-host "Does Double1+.1 not equal Double2:" (($Double1+.1) -ne $Double2) write-host "" write-host "==========" write-host "TEST TWO" write-host "==========" $Double3 = 36.1 $Double4 = 36.2 write-host "" write-host "Value of Double3: $Double3" write-host "Type of Double3:" $Double3.GetType().FullName write-host "-----" write-host "Value of Double4: $Double4" write-host "Type of Double4:" $Double4.GetType().FullName write-host "-----" write-host "Value of Double3+.1:" ($Double3+.1) write-host "-----" write-host "Does Double3 not equal Double4:" ($Double3 -ne $Double4) write-host "Does Double3+.1 not equal Double4:" (($Double3+.1) -ne $Double4) write-host "" </code></pre>
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    1. COIt's April 1st, floating points don't work today.
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      1. USBrian Rasmussen
    2. COIf you are working just with precise decimal values (as pennies or points in gymnastics) you can use type decimal. Take a look at differences here http://stackoverflow.com/questions/618535/what-is-the-difference-between-decimal-float-and-double-in-c
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