The Fourth Dimension Space

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福大月赛 B题

这题说白了 其实很简单，就是求一个大数乘以 (根号二+1)
但奇怪的是我居然PE了，郁闷....求解答
下面是我的代码：

import java.io.*;
import java.math.*;
import java.util.*;

public class Main 
{
    
    public static void main(String[] args) 
    {
        String res;
        BigDecimal a=new BigDecimal("0");
        BigDecimal b=new BigDecimal("0");
        BigDecimal c=new BigDecimal("0");
        int tt=0;
        
        Scanner cin = new Scanner (new BufferedInputStream(System.in));
        while(cin.hasNext())
        {
            tt++;
    
                
            System.out.printf("Case %d\n",tt);
            double t;
            a=cin.nextBigDecimal();
            b=BigDecimal.valueOf( (Math.sqrt(2)+1 ) );
            c=BigDecimal.valueOf(100000.0);
            a=a.multiply(b);
            int i;
            if(a.compareTo(c)==1||a.compareTo(c)==0)
            {
                res=a.toPlainString();

                for(i=0;i<5;i++)
                    System.out.printf("%c",res.charAt(i));
                System.out.println();
            }
            else
            {
                res=a.toPlainString();
                i=0;
                while(res.charAt(i)!='.')
                {
                    
                    System.out.printf("%c",res.charAt(i));
                    i++;
                }
                System.out.printf(".");
                i++;
                int j=i;
                if(res.charAt(j+4)<'5')
                {
                    int k;
                    for(k=i;k<i+4;k++)
                        System.out.printf("%c", res.charAt(k));
                }
                
                else
                {
                    int k;
                    for(k=i;k<i+3;k++)
                        System.out.printf("%c", res.charAt(k));
                    System.out.printf("%c", res.charAt(k)+1);
                }
                
                System.out.println();
            }
            System.out.println();
            
            
        }
        
    }

}

终于AC了，还顺便把DecimalFormat学习了一下，代码如下：
原来java里面的换行符不是'\n'啊，把PE时候的那一行 System.out.printf("Case %d\n",tt);改成System.out.println("Case "+tt);就对了。。。汗　我太相信C语言了。。
RunID: 265601
UserID: abilitytao
Submit time: 2010-02-08 11:37:16
Language: JavaLength: 1317 Bytes.
Result: Accepted
import java.io.*;
import java.math.*;
import java.util.*;
import java.text.*;

public class Main 
{
    
    public static void main(String[] args) 
    {
        String res;
        BigDecimal a=new BigDecimal("0");
        BigDecimal b=new BigDecimal("0");
        BigDecimal c=new BigDecimal("0");
        int tt=0;
        
        Scanner cin = new Scanner (new BufferedInputStream(System.in));
        while(cin.hasNext())
        {
            tt++;
    
                
            System.out.println("Case "+tt);
            double t;
            a=cin.nextBigDecimal();
            b=BigDecimal.valueOf( (Math.sqrt(2)+1 ) );
            c=BigDecimal.valueOf(100000.0);
            a=a.multiply(b);
            int i;
            if(a.compareTo(c)==1||a.compareTo(c)==0)
            {
                res=a.toPlainString();

                for(i=0;i<5;i++)
                    System.out.print(res.charAt(i));
                System.out.println();
            }
            else
            {
                DecimalFormat my=new DecimalFormat("#.0000");
                String ans=my.format(a);
                System.out.println(ans);
                
            }
            System.out.println();
            
            
        }
        
    }

}

posted on 2009-11-28 17:32 abilitytao 阅读(1152) 评论(0)  编辑 收藏 引用


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