我得到正确的最终值，但数字错误

Question

我正在开发一个程序，计算当您只有 100 码的围栏时围栏区域可以达到的最大面积。四个边之一由已经存在的任意长的栅栏定义。正确答案（最大面积）是 1250 码，这是我朗读程序时得到的。但是，我还需要打印出宽度和长度尺寸以与该值一起使用，并且我得到了这些值的非常奇怪的数字（应该是 25 和 50 ).谁能解释为什么会这样，我该如何解决？

public class Prog215c{
    public static void main (String[] args){
   //Initalizing the final dimension variables
   double fin_l = 0;
   double fin_w = 0;

   //Initalizing the area variables
   double area = 0;
   double prev_area = 0;
   double max_area = 0;

   //Trying all l values
   for (double l = 100; l > 0; l--){

       //Calculating the w value from the l value
       double w = (100-l) / 2;

       //Calculating the area
       area = l * w;

       if (area >= prev_area){
               prev_area = area;

                }

              else{
                  max_area = prev_area;
                  fin_l = l;
                  fin_w = w;

                }   
    }
   //Outprinting the results 
   System.out.println("With 100 yards of fencing material:");
   System.out.println("A rectangle " + fin_w + " X " + fin_l + " yards produces the maximum area of " +
   max_area + " square yards.");


 }
    }


     /*Sample Output
    With 100 yards of fencing material:
    A rectangle 49.5 X 1.0 yards produces the maximum area of 1250.0          square yards.


     */

忽略 1250.0 后的 space（栈溢出格式化）

Answer 1

将变量设置为

更有意义

 if (area >= prev_area){
    prev_area = area;
    fin_l = l;
    fin_w = w;
 }

Answer 2

改变这个：

if (area >= prev_area){
           prev_area = area;
}

else{
      max_area = prev_area;
      fin_l = l;
      fin_w = w;

            }

通过这个：

if (area >= prev_area){
           prev_area = area;
           fin_l = l;
           fin_w = w;
            }

          else{
              max_area = prev_area;


            }

我得到正确的最终值，但数字错误

I am getting the correct end value, but with the wrong numbers

java

if-statement

rectangles