hw5_9.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_9
{
   public static void main (String args[])throws IOException
   {
      int n,num,sum=0;
      String str;
      BufferedReader buf;      
      buf = new BufferedReader(new InputStreamReader(System.in));
      System.out.println("计算1+3+5+┅+n的总和，其中n为奇数");
      System.out.print("请输入n值:");
      str = buf.readLine();     
      n= Integer.parseInt(str);
      for(num=1;num<=n;num+=2)
      sum+=num; 
      System.out.println("其总和为:"+sum);
   }
}