[Java] - 这段代码出了什么问题？

Question

使用分母2到14（包括分子小于分母）打印所有适当分数的十进制等值表。将小数点数舍入为5位。

import java.text.*;
public class Decimal 
{
    public static void main(String[] arg)
    {
        int d;
        int n=1;
        float Sum;
        DecimalFormat Form = new DecimalFormat("0.00000");
        for(d=2;d<=14;d++)
        {
            do
            { 


                Sum= n/d;
               System.out.println(n+"/"+d+"    "+Form.format(Sum));// Problem here I assume,why is the sum always Zero????!!
                             n++;     
           }while(n!=d);
           n=1;


        }

    }
}

Answer 1

您将int除以int;结果是一个整数。必须将其中一个int转换为double数据类型才能获得正确的结果。

DECLARE @index INT
    ,@ran_no INT
    ,@counter INT
    ,@i INT

SET @i = 1

WHILE @i <= 18
BEGIN
    SELECT @index = count(basket_seq)
    FROM dbo.test
    WHERE basket_seq = @i
        AND flag = 'left'

    BEGIN
        UPDATE dbo.test
        SET @ran_no = convert(INT, 1 + @index * RAND(CHECKSUM(NEWID())))
            ,@ran_no = (
                CASE 
                    WHEN convert(INT, 1 + @index * RAND(CHECKSUM(NEWID()))) NOT IN (
                            SELECT seq_no
                            FROM dbo.test
                            WHERE basket_seq = @i
                                AND flag = 'left'
                            )
                        THEN @ran_no
                    END
                )
            ,seq_no = @ran_no
        WHERE basket_seq = @i
            AND flag = 'left'
    END

    SET @i = @i + 1
END