如何更正此代码才能正常工作 [英] How do I correct this code to work properly

问题描述

我在netbeans中使用这个代码来设计计算器，但是分区符号的问题立即我将数字分开，例如9/8会给我1但是当我将数字分开时，例如。 8/2会给我正确答案，因为没有提醒

  private   void  jBtnDivActionPerformed（java.awt.event.ActionEvent evt）{
 firstnum = Double.parseDouble（jtxtDisplay.getText（））; 
 jtxtDisplay.setText（ ）; 
 operations =   / 
 
 
 < span class =code-keyword> else   if （operations ==   /）
 {
 result = firstnum / secondnum; 
 answer = 字符串 .format（ ％ .0f，结果）; 
 jtxtDisplay.setText（回答）; 

解决方案

听起来像是在划分两个整数：

初学Java - 第2单元数学运算符： [ ^ ]

执行整数除法时要小心。将整数除以整数时，答案将是整数（不是舍入的）。



比较这些除法：（5是整数，5.0是双精度）



整数除法8/5 = 1

双师8.0 / 5.0 = 1.6

混合师8.0 / 5 = 1.6

在分割之前，确保至少有一个数字是 double 。

I used this code in netbeans to design calculator but the is problem with the division sign immediately I divided the number eg 9 / 8 will give me 1 but when i divided the number eg. 8/2 will give me the correct answer since there is no reminder

private void jBtnDivActionPerformed(java.awt.event.ActionEvent evt) {
      firstnum = Double.parseDouble(jtxtDisplay.getText());
      jtxtDisplay.setText("");
      operations="/"


else if (operations == "/")
   {
       result = firstnum / secondnum;
       answer = String.format("%.0f", result);
       jtxtDisplay.setText(answer);

解决方案

Sounds like you're dividing two integers:

Beginning Java - Unit 2 Math Operators:[^]

Be careful when performing integer division. When dividing an integer by an integer, the answer will be an integer (not rounded).

Compare these divisions: (5 is an integer while 5.0 is a double)

Integer division 8 / 5 = 1
Double division 8.0 / 5.0 = 1.6
Mixed division 8.0 / 5 = 1.6

Make sure at least one of the numbers is a double before dividing.

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