diff --git a/GuiCalculator.java b/GuiCalculator.java
index 54986aea82ef7cfde15bb4d08c7ef21eb79460a7..13b41b30b97fe4fdcfe932978a609e914fb8969c 100644
--- a/GuiCalculator.java
+++ b/GuiCalculator.java
@@ -28,7 +28,7 @@ class CalculatorUI extends JFrame
 {
 	private JTextField textField=new JTextField("0");
 	
-	private JPanel panel=new JPanel(new GridLayout(4,4));
+	private JPanel panel=new JPanel(new GridLayout(5,4));
 	private JButton bt11=new JButton("7");
 	private JButton bt12=new JButton("8");
 	private JButton bt13=new JButton("9");
@@ -45,8 +45,12 @@ class CalculatorUI extends JFrame
 	private JButton bt42=new JButton(".");
 	private JButton bt43=new JButton("=");
 	private JButton bt44=new JButton("+");
+	private JButton bt51=new JButton("%");
+	private JButton bt52=new JButton("!");
+	private JButton bt53=new JButton("~");
+	private JButton bt54=new JButton("^");
 	JButton jb[]={bt11,bt12,bt13,bt14,bt21,bt22,bt23,bt24,
-		bt31,bt32,bt33,bt34,bt41,bt42,bt43,bt44};
+		bt31,bt32,bt33,bt34,bt41,bt42,bt43,bt44,bt51,bt52,bt53,bt54};
 	
 	class MyHandler implements ActionListener
 	{
@@ -98,7 +102,7 @@ class CalculatorUI extends JFrame
 		
 		this.add(panel,BorderLayout.CENTER);
 		panel.setPreferredSize(new Dimension(300,350));
-		for(int i=0;i<16;i++){
+		for(int i=0;i<20;i++){
 			jb[i].setFont(new Font("楷体",Font.BOLD,32));
 			panel.add(jb[i]);
 		}
@@ -107,7 +111,7 @@ class CalculatorUI extends JFrame
 
 	private void ListenerAdd(MyHandler myHandler)
 	{
-		for(int i=0;i<16;i++){
+		for(int i=0;i<20;i++){
 			jb[i].addActionListener(myHandler);
 		}
 	}
@@ -123,7 +127,7 @@ class CalcString
 		
 		for(int i=0;i<str.length();i++)
 		{
-			if(str.charAt(i)!='+'&&str.charAt(i)!='-'&&str.charAt(i)!='*'&&str.charAt(i)!='/')
+			if(str.charAt(i)!='+'&&str.charAt(i)!='-'&&str.charAt(i)!='*'&&str.charAt(i)!='/'&&str.charAt(i)!='%')
 			{
 				s=s+str.charAt(i);
 			}
@@ -149,6 +153,9 @@ class CalcString
 		case '/':
 			res = n1 / n2;
 			break;
+		case '%':
+			res = (int)n1 % (int)n2;
+			break;
 		default:
 		}