diff --git a/.vscode/settings.json b/.vscode/settings.json
new file mode 100644
index 0000000..e0f15db
--- /dev/null
+++ b/.vscode/settings.json
@@ -0,0 +1,3 @@
+{
+ "java.configuration.updateBuildConfiguration": "automatic"
+}
\ No newline at end of file
diff --git a/pom.xml b/pom.xml
index ea7c316..3a4f570 100644
--- a/pom.xml
+++ b/pom.xml
@@ -4,9 +4,19 @@
info.istlab.IEEE754View
IEEE754View
jar
- 1.0-SNAPSHOT
+ 0.10
IEEE754View
http://maven.apache.org
+
+
+ 11
+ UTF-8
+ UTF-8
+ 11
+ 11
+
+
+
junit
@@ -15,4 +25,56 @@
test
+
+
+
+
+ org.codehaus.mojo
+ exec-maven-plugin
+ 3.0.0
+
+ info.istlab.IEEE754View.App
+
+
+
+
+
+ maven-assembly-plugin
+
+
+
+
+
+
+ jar-with-dependencies
+
+ ${project.artifactId}-${project.version}-launcher
+ false
+
+
+
+ info.istlab.IEEE754View.App
+
+
+ all-permissions
+ .
+
+
+
+
+
+
+
+
+
diff --git a/src/main/java/info/istlab/IEEE754View/App.java b/src/main/java/info/istlab/IEEE754View/App.java
index 4845708..81afc29 100644
--- a/src/main/java/info/istlab/IEEE754View/App.java
+++ b/src/main/java/info/istlab/IEEE754View/App.java
@@ -1,13 +1,24 @@
package info.istlab.IEEE754View;
+import javax.swing.JFrame;
+
/**
* Hello world!
*
*/
public class App
{
+ static JFrame jf;
public static void main( String[] args )
{
- System.out.println( "Hello World!" );
+ jf = new JFrame("IEEE754 floating point viewer");
+ IEEE754view view = new IEEE754view();
+ jf.getContentPane().add(view);
+ // new IEEE754view();
+ jf.pack();
+ jf.setVisible(true);
+ jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+
+ jf.addWindowListener(view);
}
}
diff --git a/src/main/java/info/istlab/IEEE754View/IEEE754view.java b/src/main/java/info/istlab/IEEE754View/IEEE754view.java
new file mode 100644
index 0000000..d922ed3
--- /dev/null
+++ b/src/main/java/info/istlab/IEEE754View/IEEE754view.java
@@ -0,0 +1,283 @@
+package info.istlab.IEEE754View;
+
+import java.awt.BorderLayout;
+import java.awt.event.KeyEvent;
+import java.awt.event.KeyListener;
+import java.awt.event.WindowEvent;
+import java.awt.event.WindowListener;
+
+import javax.swing.BorderFactory;
+import javax.swing.BoxLayout;
+import javax.swing.JFrame;
+import javax.swing.JOptionPane;
+import javax.swing.JPanel;
+import javax.swing.JScrollPane;
+import javax.swing.JTextArea;
+import javax.swing.JTextField;
+
+public class IEEE754view extends JPanel implements WindowListener {
+
+ public static JFrame jf;
+
+ /**
+ * @param args
+ */
+ public static void main(String[] args) {
+ jf = new JFrame("IEEE754 floating point viewer");
+ jf.getContentPane().add(new IEEE754view());
+ // new IEEE754view();
+ jf.pack();
+ jf.setVisible(true);
+ jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+
+ }
+
+ JTextField jtf10, jtf2, jtf16, jtf2real;
+ JTextArea jta, usage;
+
+ public IEEE754view() {
+ setLayout(new BoxLayout(this, BoxLayout.Y_AXIS));
+
+ jtf10 = new JTextField();
+ jtf2 = new JTextField();
+ jtf2real = new JTextField();
+ jtf16 = new JTextField();
+ jtf16.setEditable(false);
+ JPanel v10P = new JPanel(new BorderLayout());
+ v10P.setBorder(BorderFactory.createTitledBorder("10進数表記 (例：0.5, 0.25, -0.75)"));
+ v10P.add(jtf10);
+ JPanel v2P = new JPanel(new BorderLayout());
+ v2P.setBorder(BorderFactory.createTitledBorder("IEEE754表記(2進数) 符号1bit, 指数8bit, 仮数23bit"));
+ v2P.add(jtf2);
+ JPanel v16P = new JPanel(new BorderLayout());
+ v16P.setBorder(BorderFactory.createTitledBorder("上の「指数部」の説明"));
+ v16P.add(jtf16);
+ JPanel v2rP = new JPanel(new BorderLayout());
+ v2rP.setBorder(BorderFactory.createTitledBorder("2進数表記 ( '1'+仮数23bit に、指数部を考慮して小数点や0を追加)"));
+ v2rP.add(jtf2real);
+
+ jtf16.setEditable(false);
+ jtf2real.setEditable(false);
+
+ jta = new JTextArea(10, 40);
+ JScrollPane scP = new JScrollPane(jta);
+ scP.setBorder(BorderFactory.createTitledBorder("IEEE754表記(2進数) ログ"));
+ jta.setEditable(false);
+
+ usage = new JTextArea(4, 40);
+ usage.setBorder(BorderFactory.createTitledBorder("つかいかた説明"));
+ usage.setText("10進数表記のところに、好きな数字を入れてEnterを押すと、\nIEEE754表記(2進数)〜2進数表記 が更新されます。"
+ + "\n" + "逆に、IEEE754表記(2進数)のところに、0や1を入れてEnterを押すと、\n10進数表記などが更新されます。丸め誤差に着目してみましょう。");
+ usage.setEditable(false);
+
+ add(usage);
+ add(v10P);
+ add(v2P);
+ add(v16P);
+ add(v2rP);
+ add(scP);
+
+ // setSize(500,500);
+
+ jtf10.addKeyListener(new KeyListener() {
+ @Override
+ public void keyPressed(KeyEvent arg0) {
+ if (arg0.getKeyCode() == KeyEvent.VK_ENTER) {
+ update10to2(jtf10.getText());
+ }
+ }
+
+ @Override
+ public void keyReleased(KeyEvent arg0) {
+ }
+
+ @Override
+ public void keyTyped(KeyEvent arg0) {
+
+ }
+ });
+ // jtf10.addMouseListener(new MouseAdapter(){
+ // public void mouseClicked(MouseEvent e){
+ // jtf10.selectAll();
+ // }
+ // });
+
+ jtf2.addKeyListener(new KeyListener() {
+ @Override
+ public void keyPressed(KeyEvent arg0) {
+ if (arg0.getKeyCode() == KeyEvent.VK_ENTER) {
+ update2to10(jtf2.getText());
+ }
+ }
+
+ @Override
+ public void keyReleased(KeyEvent arg0) {
+ }
+
+ @Override
+ public void keyTyped(KeyEvent arg0) {
+
+ }
+ });
+ // jtf2.addMouseListener(new MouseAdapter(){
+ // public void mouseClicked(MouseEvent e){
+ // jtf2.selectAll();
+ // }
+ // });
+ }
+
+ void update10to2(String s10) {
+ System.out.println(s10);
+ float f = Float.parseFloat(s10);
+ System.out.println(Float.toHexString(f));
+ StringBuffer sb = new StringBuffer("00000000000000000000000000000000");
+ sb.append(Integer.toBinaryString(Float.floatToRawIntBits(f)));
+
+ String orig = sb.substring(sb.length() - 32);
+ int sisuu = Integer.parseInt(orig.substring(1, 9), 2);
+ jtf2.setText(separated(orig));
+ logappend(separated(orig) + " ← " + s10);
+ // jtf16.setText(Float.toHexString(f) + " / " + orig.substring(1, 9) + " = " +
+ // sisuu + " = 127 + （ " + (sisuu - 127)
+ // + " ）");
+ jtf16.setText(orig.substring(1, 9) + " = " + sisuu + " = 127 + （ " + (sisuu - 127)
+ + " ）");
+ System.out.println(Integer.toBinaryString(Float.floatToRawIntBits(f)));
+
+ jtf2real.setText(orig754to2(orig));
+ // System.out.println(Integer.toBinaryString(Float.floatToRawIntBits(0.5f)));
+ //
+ // System.out.println(Integer.toBinaryString(1));
+ // System.out.println(Integer.toBinaryString(2));
+ }
+
+ String orig754to2(String orig) {
+ int sisuu = Integer.parseInt(orig.substring(1, 9), 2);
+ int shift = sisuu - 127;
+ StringBuffer sb = new StringBuffer("1");
+ sb.append(orig.substring(9));
+ if (shift > -1) {
+ try {
+ sb.insert(shift + 1, ".");
+ } catch (StringIndexOutOfBoundsException ex) {
+ sb.append(" ");
+ for (int i = 1; i <= shift - 23; i++)
+ sb.append("0");
+ // sb.deleteCharAt(23);
+
+ }
+ } else {
+ StringBuffer pre = new StringBuffer();
+ for (int i = 1; i <= Math.abs(shift); i++) {
+ pre.append("0");
+ }
+ pre.insert(1, ".");
+ sb.insert(0, pre.toString());
+ }
+ return sb.toString();
+ }
+
+ void logappend(String s) {
+ jta.append(s + "\n");
+ jta.setCaretPosition(jta.getDocument().getLength());
+ }
+
+ void update2to10(String s2) {
+ // System.out.println(s2);
+ String orig = s2.replaceAll(" ", "") + "000000000000000000000000000000000000000000000";
+ // System.out.println(orig);
+ int p;
+ try {
+ p = Integer.parseInt(orig.substring(1, 32), 2);
+ } catch (NumberFormatException e) {
+ JOptionPane.showMessageDialog(this, "入力値は変換できません");
+ return;
+ }
+ int cursorpos = jtf2.getCaretPosition();
+ jtf2.setText(separated(orig.substring(0, 32)));
+ jtf2.setCaretPosition(cursorpos);
+ float f = Float.intBitsToFloat(p);
+ if (orig.charAt(0) == '1')
+ f = -f;
+ int sisuu = Integer.parseInt(orig.substring(1, 9), 2);
+ // System.out.println(f);
+ if (Float.NaN != f) {
+ jtf10.setText(String.valueOf(f));
+ jtf16.setText(orig.substring(1, 9) + " = " + sisuu + " = 127 + （ " + (sisuu - 127)
+ + " ）");
+ jtf2real.setText(orig754to2(orig.substring(0, 32)));
+
+ // jtf16.setText(Float.toHexString(f) + " / " + orig.substring(1, 9) + " = " +
+ // sisuu + " = " + (sisuu - 127)
+ // + " + 127");
+ logappend(separated(orig.substring(0, 32)) + " ⇒ " + String.valueOf(f));
+ } else {
+ JOptionPane.showMessageDialog(this, "入力値は変換できません");
+ }
+ }
+
+ // IEEE754表記の、符号と指数と仮数4bitずつの区切りスペースをいれる。入力文字列は区切り無し。
+ public String separated(String s) {
+ StringBuffer sb = new StringBuffer(s);
+ sb.insert(29, " ");
+ sb.insert(25, " ");
+ sb.insert(21, " ");
+ sb.insert(17, " ");
+ sb.insert(13, " ");
+ sb.insert(9, " ");
+ sb.insert(1, " ");
+
+ return sb.toString();
+ }
+
+ // 10進数を2進数表記文字列へ変換するメソッド
+ public static final String toBinaryDigit(int a) {
+ StringBuffer buf = new StringBuffer();
+ for (int i = 31; i >= 0; i--) { // Javaのintは32ビット(4バイト)
+ buf.append((a & (int) Math.pow(2, i)) >>> i);
+ }
+ return buf.toString();
+ }
+
+ @Override
+ public void windowOpened(WindowEvent e) {
+ jtf10.requestFocus();
+
+ }
+
+ @Override
+ public void windowClosing(WindowEvent e) {
+ // TODO Auto-generated method stub
+
+ }
+
+ @Override
+ public void windowClosed(WindowEvent e) {
+ // TODO Auto-generated method stub
+
+ }
+
+ @Override
+ public void windowIconified(WindowEvent e) {
+ // TODO Auto-generated method stub
+
+ }
+
+ @Override
+ public void windowDeiconified(WindowEvent e) {
+ // TODO Auto-generated method stub
+
+ }
+
+ @Override
+ public void windowActivated(WindowEvent e) {
+ // TODO Auto-generated method stub
+
+ }
+
+ @Override
+ public void windowDeactivated(WindowEvent e) {
+ // TODO Auto-generated method stub
+
+ }
+}