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MathGroup Archive 2004

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Re: Where does Return return to?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg48629] Re: Where does Return return to?
  • From: koopman at sfu.ca (Ray Koopman)
  • Date: Tue, 8 Jun 2004 00:48:27 -0400 (EDT)
  • References: <ca1d48$d0r$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

This may make the problem clearer. 
Why does Return exit Block in func1 but not in func2 or func3? 

In[1]:= func1 := Block[{L = 2}, 
                 While[L > 1, If[True, Return[1]]; L--]; 0]

In[2]:= func2 := Block[{L = 2}, 
                 While[If[True, Return[1]]; --L > 1]; 0]

In[3]:= func3 := Block[{},
                 Do[If[True, Return[1]], {L,2,2,-1}]; 0]

In[4]:= func1
Out[4]= 1

In[5]:= func2
Out[5]= 0

In[6]:= func3
Out[6]= 0


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