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### Re: Precedence for Idiots

by calin (Deacon)
 on Dec 04, 2006 at 21:59 UTC ( #587746=note: print w/replies, xml ) Need Help??

in reply to Precedence for Idiots

Two comments:

If, like me, you don't come from a comp-sci background, then precedence-awareness of operators probably only goes as far as knowing that 3*2+1 means (3*2)+1, and that if you want 3*(2+1), then you'd better damn well say so.

I think putting the addition first (to the left) in your example illustrates the concept of precedence awareness better. Like: 1+3*2 is actually 1+(3*2) and not (1+3)*2.

Second comment: A short paragraph about the C-istic awkward precedence of some operators might be helpful to beginners without a C background. \$x == \$y & \$z means (\$x == \$y) & \$z. Enabling warnings catches this btw.

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Re^2: Precedence for Idiots
by Melly (Hermit) on Dec 04, 2006 at 23:18 UTC

Good points - I'll edit the article to include them.

```map{\$a=1-\$_/10;map{\$d=\$a;\$e=\$b=\$_/20-2;map{(\$d,\$e)=(2*\$d*\$e+\$a,\$e**2
-\$d**2+\$b);\$c=\$d**2+\$e**2>4?\$d=8:_}1..50;print\$c}0..59;print\$/}0..20
[download]```
Tom Melly, pm@tomandlu.co.uk

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