Jim Gibson wrote:
On Jun 13, 2013, at 10:51 AM, lee wrote:
+ Is "print" and "printf" pretty much the same thing implementation
wise? I'm wondering if "printf" might involve more overhead so it
might be less efficient, depending on what you're doing.
They are pretty much the same. print will use its default formats for
converting numerical data to strings. printf will use the format
specifiers you provide. There can't be much difference in execution
speed, probably not even enough to measure.
print and printf both use filehandles the same:
$ perl -Mwarnings -Mstrict -e'
print STDERR "Hello print\n";
printf STDERR q/%s/, "Hello printf\n";
'
Hello print
Hello printf
Perl allows interpolation in double quoted strings so you shouldn't use
it in printf's format string:
$ perl -Mwarnings -Mstrict -e'
my ( $x, $y, $z ) = ( "10%", "15%", "26%" );
print "Hello $x, $y, $z\n";
printf "Hello $x, $y, $z\n";
'
Hello 10%, 15%, 26%
Invalid conversion in printf: "%," at -e line 4.
Invalid conversion in printf: "%," at -e line 4.
Invalid conversion in printf: "%\012" at -e line 4.
Hello 10%, 15%, 26%
print is affected by the variables $, and $\ but printf isn't:
$ perl -Mwarnings -Mstrict -e'
my ( $x, $y, $z ) = ( "10%", "15%", "26%" );
( $,, $\ ) = ( "<*MIDDLE*>", "<*THE END*>" );
print "Hello", $x, $y, $z, "\n";
printf "Hello %s, %s, %s\n", $x, $y, $z;
'
Hello<*MIDDLE*>10%<*MIDDLE*>15%<*MIDDLE*>26%<*MIDDLE*>
<*THE END*>Hello 10%, 15%, 26%
John
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