D语言字符串连接

import std.stdio;

void main(string[] args) { 
   string greeting1 = "Good"; 
   char[] greeting2 = "morning".dup; 

   char[] greeting3 = greeting1~" "~greeting2; 
   writefln("%s",greeting3); 

   string greeting4 = "morning"; 
   string greeting5 = greeting1~" "~greeting4; 
   writefln("%s",greeting5); 
}