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PocketCalc ///////////////////////////////////////////////////////////////////// // // PocketCalc emulates a pocket calculator of the simplest // kind. It was Mikael Bonnier's first Java program. // // PocketCalc v1.0b1 is Freeware // Commercial Distribution Restricted // Copyright (C) 1995 by Mikael Bonnier, Lund, Sweden. // // // It was developed using JDK-beta2 on Windows 95. // // Suggestions, improvements, and bug-reports // are always welcome to: // Mikael Bonnier // Osten Undens gata 88 // S-227 62 LUND // SWEDEN // // Or use my internet addresses: // mikaelb@df.lth.se // http://www.df.lth.se/~mikaelb // // Mikael Bonnier ///////////////////////////////////////////////////////////////////// import java.awt.*; import java.applet.Applet; public class PocketCalc extends Applet { TextField txtDisp; public final int OP_NONE = 0; public final int OP_ADD = 1; public final int OP_SUB = 2; public final int OP_MUL = 3; public final int OP_DIV = 4; public final int OP_NEG = 5; public final int OP_SQRT = 6; public final int OP_EQ = 7; public final int OP_C = 8; public final int OP_AC = 9; public final int DECSEP = -1; String msDecimal; int mnOp = OP_NONE; boolean mbNewNumber = true; boolean mbDecimal = false; double mdReg = 0.0; public void init() { CalcButton btn0, btn1, btn2, btn3, btn4, btn5, btn6, btn7, btn8, btn9; CalcButton btnDecSep, btnNeg, btnSqrt, btnPlus, btnMinus; CalcButton btnTimes, btnDiv, btnEqual, btnClear, btnAllClear; setLayout(null); setFont(new Font("Helvetica", Font.PLAIN, 14)); setBackground(new Color(0xFF, 0x80, 0x00)); btn0 = new CalcButton("0", OP_NONE, 0); add(btn0); btn0.reshape(64, 144, 96, 24); btn1 = new CalcButton("1", OP_NONE, 1); add(btn1); btn1.reshape(64, 112, 40, 24); btn2 = new CalcButton("2", OP_NONE, 2); add(btn2); btn2.reshape(120, 112, 40, 24); btn3 = new CalcButton("3", OP_NONE, 3); add(btn3); btn3.reshape(176, 112, 40, 24); btn4 = new CalcButton("4", OP_NONE, 4); add(btn4); btn4.reshape(64, 80, 40, 24); btn5 = new CalcButton("5", OP_NONE, 5); add(btn5); btn5.reshape(120, 80, 40, 24); btn6 = new CalcButton("6", OP_NONE, 6); add(btn6); btn6.reshape(176, 80, 40, 24); btn7 = new CalcButton("7", OP_NONE, 7); add(btn7); btn7.reshape(64, 48, 40, 24); btn8 = new CalcButton("8", OP_NONE, 8); add(btn8); btn8.reshape(120, 48, 40, 24); btn9 = new CalcButton("9", OP_NONE, 9); add(btn9); btn9.reshape(176, 48, 40, 24); btnDecSep = new CalcButton("·", OP_NONE, DECSEP); add(btnDecSep); btnDecSep.reshape(176, 144, 40, 24); btnNeg = new CalcButton("+/-", OP_NEG, 0); add(btnNeg); btnNeg.reshape(8, 48, 40, 24); btnSqrt = new CalcButton("Sqrt", OP_SQRT, 0); add(btnSqrt); btnSqrt.reshape(8, 80, 40, 24); btnPlus = new CalcButton("+", OP_ADD, 0); add(btnPlus); btnPlus.reshape(232, 112, 40, 56); btnMinus = new CalcButton("-", OP_SUB, 0); add(btnMinus); btnMinus.reshape(288, 112, 40, 24); btnTimes = new CalcButton("×", OP_MUL, 0); add(btnTimes); btnTimes.reshape(232, 80, 40, 24); btnDiv = new CalcButton("÷", OP_DIV, 0); add(btnDiv); btnDiv.reshape(288, 80, 40, 24); btnEqual = new CalcButton("=", OP_EQ, 0); add(btnEqual); btnEqual.reshape(288, 144, 40, 24); btnClear = new CalcButton("C", OP_C, 0); add(btnClear); btnClear.reshape(8, 112, 40, 24); btnAllClear = new CalcButton("AC", OP_AC, 0); add(btnAllClear); btnAllClear.reshape(8, 144, 40, 24); txtDisp = new TextField("0", 80); txtDisp.setEditable(false); add(txtDisp); txtDisp.reshape(64, 8, 268, 27); String sOneTenth = (new Double(0.1)).toString(); msDecimal = sOneTenth.substring(sOneTenth.length()-2).substring(0, 1); } public static void main(String args[]) { Frame frm = new Frame("Pocket Calculator"); PocketCalc ex1 = new PocketCalc(); ex1.init(); frm.add("Center", ex1); frm.pack(); frm.resize(395, 179); frm.show(); } public void append(int nValue) { String sDigit; if(nValue == DECSEP) if(!mbDecimal) { if(mbNewNumber) { txtDisp.setText("0"); mbNewNumber = false; } mbDecimal = true; sDigit = msDecimal; } else return; else sDigit = (new Integer(nValue)).toString(); if(mbNewNumber) { txtDisp.setText(sDigit); mbNewNumber = false; } else txtDisp.setText(txtDisp.getText() + sDigit); repaint(); } public void doOp(int nNewOp) { double dDisp; dDisp = (new Double(txtDisp.getText())).doubleValue(); switch(nNewOp) { case OP_NEG: case OP_SQRT: case OP_C: case OP_AC: switch(nNewOp) { case OP_NEG: txtDisp.setText((new Double(-dDisp)).toString()); break; case OP_SQRT: txtDisp.setText((new Double(Math.sqrt(dDisp))).toString()); mbNewNumber = true; mbDecimal = false; break; case OP_C: mbNewNumber = true; mbDecimal = false; txtDisp.setText("0"); break; case OP_AC: mnOp = OP_NONE; mbNewNumber = true; mbDecimal = false; mdReg = 0.0; txtDisp.setText("0"); break; } break; case OP_ADD: case OP_SUB: case OP_MUL: case OP_DIV: case OP_EQ: switch(mnOp) { case OP_ADD: mdReg = mdReg + dDisp; break; case OP_SUB: mdReg = mdReg - dDisp; break; case OP_MUL: mdReg = mdReg * dDisp; break; case OP_DIV: mdReg = mdReg / dDisp; break; case OP_EQ: case OP_NONE: mdReg = dDisp; break; } mnOp = nNewOp; mbNewNumber = true; mbDecimal = false; txtDisp.setText((new Double(mdReg)).toString()); break; } } } class CalcButton extends Button { int mnOp; int mnValue; CalcButton(String sText, int nOp, int nValue) { super(sText); mnOp = nOp; mnValue = nValue; } public boolean action(Event evt, Object arg) { PocketCalc par = (PocketCalc)getParent(); if(mnOp == par.OP_NONE) par.append(mnValue); else { par.doOp(mnOp); } return true; } }

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