• bearophile <bearophileHUGS lycos.com> Jan 07 2008

bearophile <bearophileHUGS lycos.com> writes:

Bill Baxter:
 but for a programming language it's bad practice to
 have a lot of magic literals in your code anyway.  I.e.
 
     creal rot45 = creal(.707, 707);
     creal xr = rot45 * x;
 
 is better than
     creal xr = (.707 + 0.707i) * x;
 
 in my opinion.  As long as complex constants can still be put in static 
 arrays, it should be ok.


Python has the literals too:

 complex(5)






 (6 + 2j - 1 + 3j) / 3j






 (complex(6, 2) - complex(1, 3)) / complex(0,3)








But maybe imaginary literals aren't necessary:

C++
complex<long double> a = 5;
complex<long double> b(0,7);
c = a + b + complex<long double>(0,7);

Current D:
creal a = 5;
ireal b = 7i;
c = a + b + 7i;

Alternative:
auto a = creal(5); // == creal(5,0)
auto b = ireal(7);
c = a + b + ireal(7);


C++:
c = (complex<double>(6,2) + complex<double>(-1,3)) / complex<double>(0,3);

Current D:
c = (6 + 2i - 1 + 3i) / 3i;

Alternative:
c = (creal(6,2) + cdouble(-1,3)) / idouble(3);

Bye,
bearophile