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一、

1.源程序：import javax.swing.JOptionPane;       

              public class FourOperations{  

                               public static void main( String args[] ) { 

                                String firstNumber,            

                                secondNumber;           

                                int number1,  number2;       

                                double  he,cha,ji,shang;             

                                firstNumber =

                               JOptionPane.showInputDialog( "请输入第一个数字：" );

                               secondNumber =

                               JOptionPane.showInputDialog( "请输入第二个数字：" );

                               number1 = Integer.parseInt( firstNumber );

                               number2 = Integer.parseInt( secondNumber );

                                he = number1 + number2;      

                                cha= number1 - number2;    

                                 ji = number1 * number2;             

                                shang=number1/ number2;          

                               JOptionPane.showMessageDialog(

                              null, "和是 ：" + he+"差是："+cha+"积是："+ji+"商是："+shang,"Results",

                             JOptionPane.PLAIN_MESSAGE );

                             System.exit( 0 );    

                     }

              }

2.消息框截图：

二、

1.

2.

结论：使用double类型的数值进行计算， 其结果是不精确。

3.

截图：

课后作业

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原文地址：http://www.cnblogs.com/longmakk/p/4858735.html