Because the context is different. 

$ perl -le"print for @ARGV" a s d f
a
s
d
f

$ perl -le"print for 0+@ARGV" a s d f
4

$ perl -le"print for scalar @ARGV" a s d f
4

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Context tutorial

In reply to Re: different outputs for array print by Anonymous Monk
in thread different outputs for array print by manishrathi

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