Thread: printf not working with long type

Code:

long stirling1(int n)
{
      double nd = n;
      
      return ( pow(nd,nd)  * exp(-nd) * sqrt( (2 * PI * nd) ));
}

Code:

long stirling2(int n)
{
      double nd = n;
      
      return ( pow(nd,nd)  * exp(-nd) * sqrt( (2 * PI * nd) ) * (1 + 1/(12*nd)) );
}

Code:

for(int i = 1; i<=input; i++)
	      	  printf("%4d %14d %20.10e %20.10e\n", i, factorial(i), stirling1(i), stirling2(i));

The above code does not print the correct values for stirling1() and stirling2(). I think this has something to do with the printf because when i change the "%20.10e" to "%20d" the numbers are correct in decimal form. I know the calculations are right, but i can't figure out why the printing is wrong.
Here is the output:

Code:

Number    Factorial      Approximation1      Approximation2
---------------------------------------------------------------------
   1              1     0.0000000000e+00    4.2419181287e-314
   2              2    2.1219957915e-314    6.3639139197e-314
   3              6    1.0609978957e-313    1.4851897084e-313
   4             24    4.8805903204e-313    5.3047821321e-313
   5            120    2.5039550339e-312    2.5675941725e-312
   6            720    1.5066170119e-311    1.5299568918e-311
   7           5040    1.0567539041e-310    1.0696978709e-310
   8          40320    8.4671876071e-310    8.5560990214e-310
   9         362880    7.6293387888e-309    7.7003195255e-309
  10        3628800    1.2745071711e-307    1.3000610917e-307
  11       39916800    2.7223431127e-297    3.2649323566e-297

You do know that long isn't a floating point type, right? It's integral.


Quzah.