I still don't understand why eval { } || 0 did not work though

eval doesn't affect warnings. And the warning occurred during the division, not after the eval was completed. 

>perl -we"my $x; my $q = eval { $x / 4 } || 0;
Use of uninitialized value in division (/) at -e line 1.

>perl -we"my $x; my $q = eval { ($x||0) / 4 };

>perl -we"my $x; my $q = ( $x / 4 ) || 0;
Use of uninitialized value in division (/) at -e line 1.

>perl -we"my $x; my $q = ( ($x||0) / 4 );

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In reply to Re^6: eval not working the way I expected? by ikegami
in thread eval not working the way I expected? by convenientstore

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