perl 计算两个数的乘积
要求：提示用户输入两个数，结果返回两个数的乘积。
程序：
#! /usr/bin/perl
print "please input 2 numbers:\n";
$a=<STDIN>;
$b=<STDIN>;
print "the sum of the numbers is:", $a*$b, "\n";
程序：
#! /usr/bin/perl
print "please input 2 numbers:\n";
$a=<STDIN>;
$b=<STDIN>;
print "the sum of the numbers is:", $a*$b, "\n";
none
