On Tue, 11 May 2010 11:51:34 +0000, eles wrote:
> the following test case also works:
>
> Compiling
>
> import std.stdio;
> import std.complex;
>
> Complex!(double) x,y;
>
> int main(){
> writefln("salut!\n");
> x.re=1;
> x.im=1;
> y=x.conj();
> writefln("x=%f+%f*i\n",x.re,x.im);
> writefln("y=%f+%f*i\n",y.re,y.im);
> return 0;
> }
>
>
> results in
>
> C:\dmd2>dmd test.d
>
> C:\dmd2>test
> salut!
>
> x=1.000000+1.000000*i
>
> y=1.000000+-1.000000*i
>
> C:\dmd2>
Cool!
> Which is OK. However, displaying complex numbers in that way is not very
> nice. Is there any dedicated formatting for that? (it would be nice to
> be able displaying a complex number in both Cartesian and Polar formats)
The problem is that there doesn't seem to be any "standard" way of
converting stuff to strings in Phobos.
The toString() function I put into Complex is designed to write complex
numbers to an arbitrary output range. It may seem very verbose when all
you want to do is to get a simple string representation, but it was meant
as a proposal for exactly such a standard.
Another possibility was proposed by Don, as demonstrated in
std.bigint.BigInt.toString():
http://www.digitalmars.com/d/2.0/phobos/std_bigint.html#toString
The idea is that if a type defines such a toString(), it should -- in the
future, that is -- work automatically with std.conv.to(),
std.stdio.writef*() etc. Then you'd be able to do things like
auto z = Complex!real(1, -2);
auto str1 = to!string(z);
assert (str1 == "1-2i");
writefln("%.2g", z); // Prints "1.00-2.00i"
Right now, you are kind of stuck with the way you demonstrated, or you
can have Complex.toString() write to an std.array.Appender!string range.
-Lars
