信1403-2班20142897程怀远 课后题第一题

package demo;
//An addition program 

import javax.swing.JOptionPane;  // import class JOptionPane

public class Addition {
public static void main( String args[] )
{
   String firstNumber,   // first string entered by user
          secondNumber;  // second string entered by user
   int number1,          // first number to add
       number2,          // second number to add
       sum,
          cha,ji,shang;// sum of number1 and number2

   // read in first number from user as a string
   firstNumber =
      JOptionPane.showInputDialog( "Enter first integer" );

   // read in second number from user as a string
   secondNumber =
      JOptionPane.showInputDialog( "Enter second integer" );

   // convert numbers from type String to type int
   number1 = Integer.parseInt( firstNumber ); 
   number2 = Integer.parseInt( secondNumber );

   // add the numbers
   sum = number1 + number2;
   cha = number1 - number2;
   ji = number1 * number2;
   shang = (number1 / number2) + (number1 % number2);

   // display the results
   JOptionPane.showMessageDialog(
      null, "The sum is " + sum 
      +"\n" + "The cha is:" + cha
      +"\n" +"The ji is:" + ji
      +"\n" +"The shang is:" + shang
       );
   
   System.exit( 0 );   // terminate the program
}
}