D语言sizeof运算符

import std.stdio;

int main(string[] args) { 
   int a = 4; 
   short b; 
   double c; 
   int* ptr;

   /* example of sizeof operator */ 
   writefln("Line 1 - Size of variable a = %d/n", a.sizeof ); 
   writefln("Line 2 - Size of variable b = %d/n", b.sizeof ); 
   writefln("Line 3 - Size of variable c= %d/n", c.sizeof );  

   /* example of & and * operators */ 
   ptr = &a; /* 'ptr' now contains the address of 'a'*/ 
   writefln("value of a is  %d/n", a); 
   writefln("*ptr is %d./n", *ptr);  

   /* example of ternary operator */ 
   a = 10; 
   b = (a == 1) ? 20: 30; 
   writefln( "Value of b is %d/n", b ); 

   b = (a == 10) ? 20: 30; 
   writefln( "Value of b is %d/n", b ); 
   return 0; 
}