[TCL] Round a number (5.55 => 5.6 instead of 5.5 as 'format %.2f' would do it)

07-22-2018, 04:50 +0200

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[TCL] Round a number (5.55 => 5.6 instead of 5.5 as 'format %.2f' would do it)

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thommey

03-04-2006, 21:08

| [TCL] Round a number (5.55 => 5.6 instead of 5.5 as round() would do it)

Jabber

(Administrator)
Member since 03/2004
62 Posts

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proc round {number {digits 0}} {
    return [expr {round(pow(10,$digits)*$number)/pow(10,$digits)}]
}

robeadam

10-28-2011, 00:29

Member since 10/2011
1 Post
Location: Johns Creek, GA

This was exactly what I was looking for but after playing with it a bit, I'd recommend 1 change. If the user passes the proc 1 digit, the returned value would be \d.\d which is great. But if the user doesn't pass digits or passes it as 0, the return will be \d.0 which is inaccurate. So the enhancement would be:

proc round {number {digits 0}} {

   if { $digits} {
      return [expr {round(pow(10,$digits)*$number)/pow(10,$digits)}]
   } else {
      return [ int [expr {round(pow(10,$digits)*$number)/pow(10,$digits)}]]
   }
}

Thanks for the snippet, helped a lot.

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