Question

我正在制作一个程序，计算围栏区域可以达到的最大区域，当你只有100码的围栏时。四个方面中的一个由已经存在的任意长的围栏定义。正确的答案（最大面积）是1250码，这是我在朗读程序时得到的。但是，我还需要打印宽度和长度尺寸以与该值一起使用，并且我得到非常这些值的奇怪数字（应该是25和50）。任何人都可以解释为什么会发生这种情况，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之后的空格（堆栈溢出格式化）

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;

            }

由此：

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

          else{
              max_area = prev_area;


            }

我得到了正确的结束值，但数字错误

2 个答案: