Type conversions in D

[Jean Cesar via Digitalmars-d-learn]

I once saw an article that talked about type conversions using 
the D language.

Type convert integer to exadecimal, binary, but I'm thinking of 
writing an article in my blog but I do not find the site I saw on 
to know more information of the same type as I did below.

void main()
{
   int a=15;

  writefln("O numero %s em binario é %b", a, a);
}