Calculate 1 with a while loop statement! +2! + ... 20! The sum

 PackageNothh; Public classMMM { Public Static voidMain (string[] args) {//TODO auto-generated Method Stub//compared to the sum of factorial, the inverse of factorial and the need to use a float or double.         floatx = 0; floaty = 0; intz = 20;  while(z>0) {x=Z;  for(intj = z-1; J > 0; j--) {x= J *x; } z--; //On the basis of the sum of the factorial, the reciprocal value of x is assigned. x = 1/x; Y= x+y;                    } System.out.println (y); }        }

The result is 1.7182819, the number of decimal places is limited by the data type used, and if you use double, the number of digits will be more

Calculate 1 with a while loop statement! +2! + ... 20! The sum