Java Calculator SourceCode

//*******************************// Java script of Calculator// <<>>//===============================// Ver 0.0 96/01/19 T.Yamazaki//-------------------------------// email : yamaza@st.rim.or.jp//*******************************
import java.awt.*;import java.lang.*;import java.applet.Applet;
//===================// Calculator Applet//===================public class Calc extends java.applet.Applet{ //-------- // member //-------- TextField text; String sText1, sText2; double dReg1, dReg2, dMem; String sOperator; boolean isFixReg; //------------- // constructor //------------- public Calc() { Panel pFrame = new Panel(); pFrame.setLayout(new FlowLayout());
text = new TextField(""); text.setForeground(Color.yellow); text.setEditable(false);
Panel pCalc = new Panel(); pCalc.setLayout(new BorderLayout(0, 10)); pCalc.add("North", text);
pFrame.add("Center", pCalc);
Dimension dSize= pCalc.size(); dSize.width = dSize.width + 20; dSize.height = dSize.height + 20; pFrame.resize(dSize); Panel pKey = new Panel(); pKey.setLayout(new GridLayout(5, 4, 5, 5)); add("Center", pKey); pKey.add(new Button("C")); pKey.add(new Button("MR")); pKey.add(new Button("M-")); pKey.add(new Button("M+")); pKey.add(new Button("7")); pKey.add(new Button("8")); pKey.add(new Button("9")); pKey.add(new Button("/")); pKey.add(new Button("4")); pKey.add(new Button("5")); pKey.add(new Button("6")); pKey.add(new Button("*")); pKey.add(new Button("1")); pKey.add(new Button("2")); pKey.add(new Button("3")); pKey.add(new Button("-")); pKey.add(new Button("0")); pKey.add(new Button(".")); pKey.add(new Button("=")); pKey.add(new Button("+"));
pCalc.add("South", pKey);
setLayout(new BorderLayout(0, 0)); add("North", pFrame); setBackground(Color.darkGray);
dReg1 = 0.0d; dReg2 = 0.0d; dMem = 0.0d; sOperator = ""; text.setText("0"); isFixReg = true; } //--------------- // event handler //--------------- public boolean action(Event evt, Object arg) { // // numeric key input // if ("C".equals(arg)) { dReg1 = 0.0d; dReg2 = 0.0d; sOperator = ""; text.setText("0"); isFixReg = true; } else if (("0".equals(arg)) ("1".equals(arg)) ("2".equals(arg)) ("3".equals(arg)) ("4".equals(arg)) ("5".equals(arg)) ("6".equals(arg)) ("7".equals(arg)) ("8".equals(arg)) ("9".equals(arg)) (".".equals(arg))) { if (isFixReg) sText2 = (String) arg; else sText2 = text.getText() + arg; text.setText(sText2); isFixReg = false; } // // operations // else if (("+".equals(arg)) ("-".equals(arg)) ("*".equals(arg)) ("/".equals(arg)) ("=".equals(arg))) { sText1 = text.getText(); dReg2 = (Double.valueOf(sText1)).doubleValue(); dReg1 = Calculation(sOperator, dReg1, dReg2); Double dTemp = new Double(dReg1); sText2 = dTemp.toString(); text.setText(sText2); sOperator = (String) arg; isFixReg = true; } // // memory read operation // else if ("MR".equals(arg)) { Double dTemp = new Double(dMem); sText2 = dTemp.toString(); text.setText(sText2); sOperator = ""; isFixReg = true; } // // memory add operation // else if ("M+".equals(arg)) { sText1 = text.getText(); dReg2 = (Double.valueOf(sText1)).doubleValue(); dReg1 = Calculation(sOperator, dReg1, dReg2); Double dTemp = new Double(dReg1); sText2 = dTemp.toString(); text.setText(sText2); dMem = dMem + dReg1; sOperator = ""; isFixReg = true; } // // memory sub operation // else if ("M-".equals(arg)) { sText1 = text.getText(); dReg2 = (Double.valueOf(sText1)).doubleValue(); dReg1 = Calculation(sOperator, dReg1, dReg2); Double dTemp = new Double(dReg1); sText2 = dTemp.toString(); text.setText(sText2); dMem = dMem - dReg1; sOperator = ""; isFixReg = true; } return true; } //------------- // Calculation //------------- private double Calculation(String sOperator, double dReg1, double dReg2) { if ("+".equals(sOperator)) dReg1 = dReg1 + dReg2; else if ("-".equals(sOperator)) dReg1 = dReg1 - dReg2; else if ("*".equals(sOperator)) dReg1 = dReg1 * dReg2; else if ("/".equals(sOperator)) dReg1 = dReg1 / dReg2; else dReg1 = dReg2; return dReg1; }}