Perl 中的 given-when-default 语句

given (argument) {
  when (condition) { statement(s); }
  when (condition) { statement(s); }
  when (condition) { statement(s); }
  .
  .
  .
  default { statement(s); }
}

#!/usr/local/bin/perl
use v5.10;
no warnings 'experimental';
printf "Enter any number:";
num = <STDIN>;

given(num){
  when (num>10) {
    printf "number is greater than 10\n";
  }
  when (num<10) {
    printf "number is less than 10\n";
  }
  default {
    printf "number is equal to 10\n";
  }
}

Enter any number:10
number is equal to 10