= and , operators in Perl -

please explain apparently inconsistent behaviour:

$a = b, c; print $a; # prints: b  $a = (b, c); print $a; # prints: c 

as eugene's answer seems leave questions op try explain based on that:

$a = "b", "c"; print $a; 

here left argument $a = "b" because = has higher precedence , evaluated first. after $a contains "b".

the right argument "c" , returned show soon.

at point when print $a printing b screen.

$a = ("b", "c"); print $a; 

here term ("b","c") evaluated first because of higher precedence of parentheses. returns "c" , assigned $a.

so here print "c".

$var = ($a = "b","c"); print $var; print $a; 

here $a contains "b" , $var contains "c".

once precedence rules perfectly consistent