D语言算术运算符

import std.stdio; 

int main(string[] args) { 
   int a = 21; 
   int b = 10; 
   int c ;  

   c = a + b; 
   writefln("Line 1 - Value of c is %d/n", c ); 
   c = a - b; 
   writefln("Line 2 - Value of c is %d/n", c ); 
   c = a * b; 
   writefln("Line 3 - Value of c is %d/n", c ); 
   c = a / b; 
   writefln("Line 4 - Value of c is %d/n", c ); 
   c = a % b; 
   writefln("Line 5 - Value of c is %d/n", c ); 
   c = a++; 
   writefln("Line 6 - Value of c is %d/n", c ); 
   c = a--; 
   writefln("Line 7 - Value of c is %d/n", c ); 
   char[] buf; 
   stdin.readln(buf); 
   return 0; 
}