Java利用while迴圈計算1+1/2!+1/3!……+1/20!

標籤：

 1 public static void main(String[] args) { 2         double n = 1, sum = 0; 3         while (n <= 20) { 4             sum += 1 / Factorial(n); 5             n++; 6         } 7         System.out.println(sum); 8  9     }10 11     static double Factorial(double m) {12         if (m == 1 || m == 0) {13             return 1;14         } else {15             return (m * Factorial(m - 1));16         }17     }

 

 1 public static void main(String[] args) { 2          3         double n = 1, j = 1, sum = 0; 4         while(n <= 20){ 5             j = j*n; 6             sum += 1/j; 7             n++; 8         } 9         System.out.println(sum);10     }

 

Java利用while迴圈計算1+1/2!+1/3!……+1/20!