hw5_25.java

JAVA 2面向对象程序设计(习题参考答案1-8).rar

import java.io.*;
public class hw5_25
{
   public static void main (String args[])throws IOException
   {
      int n,num,num1=1;
      float sum=0f;
      String str;
      BufferedReader buf;      
      buf = new BufferedReader(new InputStreamReader(System.in));
      System.out.println("计算1+1/1!+1/2!+1/3!+┅+1/n的总和");
      System.out.print("请输入n值:");
      str = buf.readLine();     
      n= Integer.parseInt(str);
      for(num=1;num<=n;num++) 
      {
         num1*=num;            
         sum+=1/(float)num1; 
      }
      System.out.println("其总和为:"+(sum+1.0));
   }
}