public static int doFactorial(int n){ if(n == 1){ return 1; }else{ return doFactorial(n - 1) * n; } } }
和一楼很像public class Test1 { public static void main(String[] args) { double value = 0; for (int i = 1; i < 7; i++) { int sum = getFenMU(i); System.out.println("分母值:" + sum + "结果值:" + 1.0 / sum); value += 1.0 / sum; } System.out.println("总和:" + value); } public static int getFenMU(int value) { if (value == 1) { return 1; } else { return value * getFenMU(--value); } } }
//sum=1/1!+1/2!+1/3!+1/4!+...+1/n! package com.dai.prac;import java.util.Scanner;public class AddTest { public static void main(String[] args) { System.out.println("计算1/1!+1/2!+1/3!+1/4!+...+1/n!\r请输入n的值:"); Scanner sc=new Scanner(System.in); int n = sc.nextInt(); double s=0; for(int i=1;i<=n;i++) { s+= 1/get(i);
double d = fun(5);
System.out.println(d);
}
public static double fun(int n){
if(1 == n){
return 1/doFactorial(1);
}else{
return (double)1/(doFactorial(n)) + (double)fun(n - 1);
}
}
public static int doFactorial(int n){
if(n == 1){
return 1;
}else{
return doFactorial(n - 1) * n;
}
}
}
double value = 0;
for (int i = 1; i < 7; i++) {
int sum = getFenMU(i);
System.out.println("分母值:" + sum + "结果值:" + 1.0 / sum);
value += 1.0 / sum;
}
System.out.println("总和:" + value);
} public static int getFenMU(int value) {
if (value == 1) {
return 1;
} else {
return value * getFenMU(--value);
}
}
}
package com.dai.prac;import java.util.Scanner;public class AddTest
{
public static void main(String[] args)
{
System.out.println("计算1/1!+1/2!+1/3!+1/4!+...+1/n!\r请输入n的值:");
Scanner sc=new Scanner(System.in);
int n = sc.nextInt();
double s=0;
for(int i=1;i<=n;i++)
{
s+= 1/get(i);
}
System.out.println(s);
} private static double get(int i)
{
if(i==1){
return 1;
}
else
{
return i*get(i-1);
}
}}
public static int get(int i)
{
int start=1;
int sum=1;
for(;start<=i;start++)
{
sum*=start;
}
return sum;
}
{
if(x==n){
return 1/x;
} else {
return 1+1/(x+1)*(get(x+1,n));
}}