Re: [Dev-C++] Number backwards?

[Bolek V. <vr...@pa...>]

BTW, you can modify my function to revert the number in any base:

unsigned backwards( unsigned n, unsigned base) throw( invalid_argument)
// Reverse order of digits of n in base base
{
  if (base < 2) throw invalid_argument( "Base must be > 1");

  unsigned result = 0;

  while (n > 0) {
    result = base*result + n % base;
    n = n / base;
  }
  return result;
}

Works for any base > 2, even for 312, for example.

However, it has a disadvantage to converting via string. If you have a
number like 12345000 and want 00054321, you get just 54321 - unless you
set the output field width properly which requires further algorithm.

-- 
============================================================
                           Ing. Boleslav Vrany
                           Stanice techniku DDM hl. m. Prahy
                           Pod Juliskou 2a
                           Praha 6 - Dejvice
                           16000
                           Czech Republic

                           tel. (420 2) 243 10 240