Расчёт основания натурального логарифма

[egoregor]

/********  Расчёт основания натурального логарифма ********
           E = 2.71828182845903...
           e = 1 + 1 + 1/2! + 1/3! + ... + 1/n!

             1     1     1         1
E = 1 + 1 + --- + --- + --- + ... ---
             2!    3!    4!        n!
**********************************************************/

using System;

class __exe { public static void Main () { Console.Clear();

double e = 0 ;
double E = 2.71828182845903 ;

Console.WriteLine("{0} {1}" , E , "= standart value  " );

e = 0 ; e = E_2_for () ;
Console.WriteLine("{0} {1}" , e , "= E_2_for         " );

e = 0 ; e = E_2_while () ;
Console.WriteLine("{0} {1}" , e , "= E_2_while       " );

} //  Main (end)
/*********************************************************/
public static double E_2_for () {
double i = 1 ;
double j = 1 ;
double e = 1 ;
double n = 12345 ;
double znam = 1 ;

for ( i = 1 ; i <= n ; i ++ ) { znam = 1 ;
for ( j = 1 ; j <= i ; j ++ ) { znam = znam * j ; }
e = e + ( 1 / znam ) ;        }

return e ; }
/*********************************************************/
public static double E_2_while () {
double i = 1 ;
double j = 1 ;
double e = 1 ;
double n = 12345 ;
double znam = 1 ;

        i = j = 1 ;

while ( i <= n ) { znam = 1 ;         j = 1 ;
while ( j <= i ) { znam = znam * j ;  j ++  ; }
e = e + ( 1 / znam) ;                 i ++  ; }

return e ; }
/*********************************************************/
} // __exe (end)
/************************** END **************************/