?? fig02_19.pl
字號:
#!/usr/bin/perl
# Fig. 2.19: fig02_19.pl
# Program to illustrate numeric and string context, and undef
$string = "Top 10";
$number = 10.0;
print "Number is 10.0 and string is 'Top 10'\n\n";
$add = $number + $string; # 10 (not 20)
print "Adding a number and a string: $add\n";
$concatenate = $number . $string; #
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