程嶏清单9-2.txt

< linux网络编程工具>>配套源码

sub sum_of_a_and_b {
    return $a + $b;
}
$a = 3; 
$b = 4;
$c = sum_of_a_and_b();  
print $c,"\n";
$d = 3*sum_of_a_and_b();
print $d;