申明：這是原創的，Android2.0+MyEclipse7.0/8.5平臺，允許隨意轉載複製，歡迎大家學習交流！
主程序：Claculator.java
package com.android.calculator;
//import java.text.NumberFormat;
import java.text.DecimalFormat;
import android.app.Activity;
import android.os.Bundle;
import android.widget.*;
import android.view.View.*;
import android.view.*;
import java.util.*;
public class Calculator extends Activity
{
private Button[] btn = new Button[10]; //0~9十個按鍵
private EditText input; //顯示器
private TextView mem; //顯示器下方的記憶器，用於記錄上一次計算結果
private TextView _drg; //三角計算時標誌顯示：角度還是弧度
private TextView tip; //小提示，用於加強人機交互的弱檢測、提示
private Button
div, mul, sub, add, equal, // ÷ × - + =
sin, cos, tan, log, ln, //函數
sqrt, square, factorial, bksp, //根號 平方 階乘 退格
left, right, dot, exit, drg, //（ ） . 退出 角度弧度控制鍵
mc, c; // mem清屏鍵 input清屏鍵
public String str_old; //保存原來的算式樣子，爲了輸出時好看，因計算時，算式樣子被改變
public String str_new; //變換樣子後的式子
public boolean vbegin = true; //輸入控制，true爲重新輸入，false爲接着輸入
public boolean drg_flag = true; //控制DRG按鍵，true爲角度，false爲弧度
public double pi=4*Math.atan(1); //3.14
public boolean tip_lock = true; //true表示正確，可以繼續輸入；false表示有誤，輸入被鎖定
public boolean equals_flag = true; //判斷是否是按=之後的輸入，true表示輸入在=之前，false反之
public void onCreate(Bundle icicle)
{
super.onCreate(icicle);
setContentView(R.layout.main);
input = (EditText)findViewById(R.id.input);
mem = (TextView)findViewById(R.id.mem);
tip = (TextView)findViewById(R.id.tip);
_drg = (TextView)findViewById(R.id._drg);
btn[0] = (Button)findViewById(R.id.zero);
btn[1] = (Button)findViewById(R.id.one);
btn[2] = (Button)findViewById(R.id.two);
btn[3] = (Button)findViewById(R.id.three);
btn[4] = (Button)findViewById(R.id.four);
btn[5] = (Button)findViewById(R.id.five);
btn[6] = (Button)findViewById(R.id.six);
btn[7] = (Button)findViewById(R.id.seven);
btn[8] = (Button)findViewById(R.id.eight);
btn[9] = (Button)findViewById(R.id.nine);
div = (Button)findViewById(R.id.divide);
mul = (Button)findViewById(R.id.mul);
sub = (Button)findViewById(R.id.sub);
add = (Button)findViewById(R.id.add);
equal = (Button)findViewById(R.id.equal);
sin = (Button)findViewById(R.id.sin);
cos = (Button)findViewById(R.id.cos);
tan = (Button)findViewById(R.id.tan);
log = (Button)findViewById(R.id.log);
ln = (Button)findViewById(R.id.ln);
sqrt = (Button)findViewById(R.id.sqrt);
square = (Button)findViewById(R.id.square);
factorial = (Button)findViewById(R.id.factorial);
bksp = (Button)findViewById(R.id.bksp);
left = (Button)findViewById(R.id.left);
right = (Button)findViewById(R.id.right);
dot = (Button)findViewById(R.id.dot);
exit = (Button)findViewById(R.id.exit);
drg = (Button)findViewById(R.id.drg);
mc = (Button)findViewById(R.id.mc);
c = (Button)findViewById(R.id.c);
for(int i = 0; i < 10; ++i) {
btn[i].setOnClickListener(actionPerformed);
}
div.setOnClickListener(actionPerformed);
mul.setOnClickListener(actionPerformed);
sub.setOnClickListener(actionPerformed);
add.setOnClickListener(actionPerformed);
equal.setOnClickListener(actionPerformed);
sin.setOnClickListener(actionPerformed);
cos.setOnClickListener(actionPerformed);
tan.setOnClickListener(actionPerformed);
log.setOnClickListener(actionPerformed);
ln.setOnClickListener(actionPerformed);
sqrt.setOnClickListener(actionPerformed);
square.setOnClickListener(actionPerformed);
factorial.setOnClickListener(actionPerformed);
bksp.setOnClickListener(actionPerformed);
left.setOnClickListener(actionPerformed);
right.setOnClickListener(actionPerformed);
dot.setOnClickListener(actionPerformed);
exit.setOnClickListener(actionPerformed);
drg.setOnClickListener(actionPerformed);
mc.setOnClickListener(actionPerformed);
c.setOnClickListener(actionPerformed);
}
/*
* 鍵盤命令撲捉
*/
String[] Tipcommand = new String[500]; //命令緩存，用於檢測輸入合法性
int tip_i = 0; //Tipcommand的指針
private OnClickListener actionPerformed = new OnClickListener() {
public void onClick(View v) {
String
command = ((Button)v).getText().toString(), //按鍵上的命令獲取
str = input.getText().toString(); //顯示器上的字符串
if(equals_flag == false && "0123456789.()sincostanlnlogn!+-×÷√^".indexOf(command) != -1) {
if(right(input.getText().toString())) {
if("+-×÷√^)".indexOf(command) != -1) {
for(int i =0 ; i < input.getText().toString().length(); i++) {
Tipcommand[tip_i] = String.valueOf(input.getText().toString().charAt(i));
tip_i++;
}
vbegin = false;
}
} else {
input.setText("0");
vbegin = true;
tip_i = 0;
tip_lock = true;
tip.setText("Welcome");
}
equals_flag = true;
}
if(tip_i > 0)
TipChecker(Tipcommand[tip_i-1] , command);
else if(tip_i == 0) {
TipChecker("#" , command);
}
if("0123456789.()sincostanlnlogn!+-×÷√^".indexOf(command) != -1 && tip_lock) {
Tipcommand[tip_i] = command;
tip_i++;
}
if("0123456789.()sincostanlnlogn!+-×÷√^".indexOf(command) != -1
&& tip_lock) { //共25個按鍵
print(command);
} else if(command.compareTo("DRG") == 0 && tip_lock) {
if(drg_flag == true) {
drg_flag = false;
_drg.setText(" RAD");
} else {
drg_flag = true;
_drg.setText(" DEG");
}
} else if(command.compareTo("Bksp") == 0 && equals_flag) {
if(TTO(str) == 3) {
if(str.length() > 3)
input.setText(str.substring(0, str.length() - 3));
else if(str.length() == 3) {
input.setText("0");
vbegin = true;
tip_i = 0;
tip.setText("Welcome");
}
} else if(TTO(str) == 2) {
if(str.length() > 2)
input.setText(str.substring(0, str.length() - 2));
else if(str.length() == 2) {
input.setText("0");
vbegin = true;
tip_i = 0;
tip.setText("Welcome");
}
} else if(TTO(str) == 1) {
if(right(str)) {
if(str.length() > 1)
input.setText(str.substring(0, str.length() - 1));
else if(str.length() == 1) {
input.setText("0");
vbegin = true;
tip_i = 0;
tip.setText("Welcome");
}
} else {
input.setText("0");
vbegin = true;
tip_i = 0;
tip.setText("Welcome");
}
}
if(input.getText().toString().compareTo("-") == 0 || equals_flag == false) {
input.setText("0");
vbegin = true;
tip_i = 0;
tip.setText("Welcome");
}
tip_lock = true;
if(tip_i > 0)
tip_i--;
} else if(command.compareTo("Bksp") == 0 && equals_flag ==false) {
input.setText("0");
vbegin = true;
tip_i = 0;
tip_lock = true;
tip.setText("Welcome");
} else if(command.compareTo("C") == 0) {
input.setText("0");
vbegin = true;
tip_i = 0;
tip_lock = true;
equals_flag = true;
tip.setText("Welcome");
} else if(command.compareTo("MC") == 0) {
mem.setText("0");
} else if(command.compareTo("exit") == 0) {
System.exit(0);
} else if(command.compareTo("=") == 0 && tip_lock && right(str) && equals_flag) {
tip_i = 0;
tip_lock = false;
equals_flag = false;
str_old = str;//保存原來算式樣子
str = str.replaceAll("sin", "s");
str = str.replaceAll("cos", "c");
str = str.replaceAll("tan", "t");
str = str.replaceAll("log", "g");
str = str.replaceAll("ln", "l");
str = str.replaceAll("n!", "!");
vbegin = true;
str_new = str.replaceAll("-", "-1×");
new calc().process(str_new);
}
tip_lock = true;
}
};
/*
* 向input輸出字符
* input.setText(str);爲清屏後輸出
* input.append(str);爲在屏幕原str後增添字符
*/
private void print(String str) {
if(vbegin)
input.setText(str);
else
input.append(str);
vbegin = false;
}
/*
* 判斷一個str是否是合法的，返回值爲true、false
* 只包含0123456789.()sincostanlnlogn!+-×÷√^的是合法的str，返回true
* 包含了除0123456789.()sincostanlnlogn!+-×÷√^以外的字符的str爲非法的，返回false
*/
private boolean right(String str) {
int i = 0;
for(i = 0;i < str.length();i++) {
if(str.charAt(i)!='0' && str.charAt(i)!='1' && str.charAt(i)!='2' &&
str.charAt(i)!='3' && str.charAt(i)!='4' && str.charAt(i)!='5' &&
str.charAt(i)!='6' && str.charAt(i)!='7' && str.charAt(i)!='8' &&
str.charAt(i)!='9' && str.charAt(i)!='.' && str.charAt(i)!='-' &&
str.charAt(i)!='+' && str.charAt(i)!='×' && str.charAt(i)!='÷' &&
str.charAt(i)!='√' && str.charAt(i)!='^' && str.charAt(i)!='s' &&
str.charAt(i)!='i' && str.charAt(i)!='n' && str.charAt(i)!='c' &&
str.charAt(i)!='o' && str.charAt(i)!='t' && str.charAt(i)!='a' &&
str.charAt(i)!='l' && str.charAt(i)!='g' && str.charAt(i)!='(' &&
str.charAt(i)!=')' && str.charAt(i)!='!')
break;
}
if(i == str.length()) {
return true;
} else {
return false;
}
}
/*
* 檢測函數，返回值爲3、2、1 表示應當一次刪除幾個？ Three+Two+One = TTO
* 爲Bksp按鈕的刪除方式提供依據
* 返回3，表示str尾部爲sin、cos、tan、log中的一個，應當一次刪除3個
* 返回2，表示str尾部爲ln、n!中的一個，應當一次刪除2個
* 返回1，表示爲除返回3、2外的所有情況，只需刪除一個（包含非法字符時要另外考慮：應清屏）
*/
private int TTO(String str) {
if((str.charAt(str.length() - 1) == 'n' &&
str.charAt(str.length() - 2) == 'i' &&
str.charAt(str.length() - 3) == 's') ||
(str.charAt(str.length() - 1) == 's' &&
str.charAt(str.length() - 2) == 'o' &&
str.charAt(str.length() - 3) == 'c') ||
(str.charAt(str.length() - 1) == 'n' &&
str.charAt(str.length() - 2) == 'a' &&
str.charAt(str.length() - 3) == 't') ||
(str.charAt(str.length() - 1) == 'g' &&
str.charAt(str.length() - 2) == 'o' &&
str.charAt(str.length() - 3) == 'l')) {
return 3;
} else if((str.charAt(str.length() - 1) == 'n' &&
str.charAt(str.length() - 2) == 'l') ||
(str.charAt(str.length() - 1) == '!' &&
str.charAt(str.length() - 2) == 'n')) {
return 2;
} else { return 1; }
}
/*
* 檢測函數，對str進行前後語法檢測
* 爲Tip的提示方式提供依據，與TipShow()配合使用
* 編號 字符 其後可以跟隨的合法字符
* 1 （ 數字|（|-|.|函數
* 2 ） 算符|）|√ ^
* 3 . 數字|算符|）|√ ^
* 4 數字 .|數字|算符|）|√ ^
* 5 算符 數字|（|.|函數
* 6 √ ^ （ |. | 數字
* 7 函數 數字|（|.
*
* 小數點前後均可省略，表示0
* 數字第一位可以爲0
*/
private void TipChecker(String tipcommand1,String tipcommand2) {
int Tipcode1 = 0 , Tipcode2 = 0;//Tipcode1表示錯誤類型，Tipcode2表示名詞解釋類型
int tiptype1 = 0 , tiptype2 = 0;//表示命令類型
int bracket = 0; //括號數
if(tipcommand1.compareTo("#") == 0 && (tipcommand2.compareTo("÷") == 0 ||
tipcommand2.compareTo("×") == 0 || tipcommand2.compareTo("+") == 0 ||
tipcommand2.compareTo(")") == 0 || tipcommand2.compareTo("√") == 0 ||
tipcommand2.compareTo("^") == 0)) {
Tipcode1 = -1;//不能作爲第一位
}
if(tipcommand1.compareTo("#") != 0) {
if(tipcommand1.compareTo("(") == 0) {
tiptype1 = 1;
} else if(tipcommand1.compareTo(")") == 0) {
tiptype1 = 2;
} else if(tipcommand1.compareTo(".") == 0) {
tiptype1 = 3;
} else if("0123456789".indexOf(tipcommand1) != -1) {
tiptype1 = 4;
} else if("+-×÷".indexOf(tipcommand1) != -1) {
tiptype1 = 5;
} else if("√^".indexOf(tipcommand1) != -1) {
tiptype1 = 6;
} else if("sincostanloglnn!".indexOf(tipcommand1) != -1) {
tiptype1 = 7;
}
if(tipcommand2.compareTo("(") == 0) {
tiptype2 = 1;
} else if(tipcommand2.compareTo(")") == 0) {
tiptype2 = 2;
} else if(tipcommand2.compareTo(".") == 0) {
tiptype2 = 3;
} else if("0123456789".indexOf(tipcommand2) != -1) {
tiptype2 = 4;
} else if("+-×÷".indexOf(tipcommand2) != -1) {
tiptype2 = 5;
} else if("√^".indexOf(tipcommand2) != -1) {
tiptype2 = 6;
} else if("sincostanloglnn!".indexOf(tipcommand2) != -1) {
tiptype2 = 7;
}
switch(tiptype1) {
case 1:
if(tiptype2 == 2 || (tiptype2 == 5 && tipcommand2.compareTo("-") != 0) ||
tiptype2 == 6)
Tipcode1 = 1;
break;
case 2:
if(tiptype2 == 1 || tiptype2 == 3 || tiptype2 == 4 || tiptype2 == 7) Tipcode1 = 2;
break;
case 3:
if(tiptype2 == 1 || tiptype2 == 7) Tipcode1 = 3;
if(tiptype2 == 3) Tipcode1 = 8;
break;
case 4:
if(tiptype2 == 1 || tiptype2 == 7) Tipcode1 = 4;
break;
case 5:
if(tiptype2 == 2 || tiptype2 == 5 || tiptype2 == 6) Tipcode1 = 5;
break;
case 6:
if(tiptype2 == 2 || tiptype2 == 5 || tiptype2 == 6 || tiptype2 == 7) Tipcode1 = 6;
break;
case 7:
if(tiptype2 == 2 || tiptype2 == 5 || tiptype2 == 6 || tiptype2 == 7) Tipcode1 = 7;
break;
}
}
if(Tipcode1 == 0 && tipcommand2.compareTo(".") == 0) {//檢測小數點的重複性
int tip_point = 0;
for(int i = 0;i < tip_i;i++) {
if(Tipcommand[i].compareTo(".") == 0) {
tip_point++;
}
if(Tipcommand[i].compareTo("sin") == 0 || Tipcommand[i].compareTo("cos") == 0 ||
Tipcommand[i].compareTo("tan") == 0 || Tipcommand[i].compareTo("log") == 0 ||
Tipcommand[i].compareTo("ln") == 0 || Tipcommand[i].compareTo("n!") == 0 ||
Tipcommand[i].compareTo("√") == 0 || Tipcommand[i].compareTo("^") == 0 ||
Tipcommand[i].compareTo("÷") == 0 || Tipcommand[i].compareTo("×") == 0 ||
Tipcommand[i].compareTo("-") == 0 || Tipcommand[i].compareTo("+") == 0 ||
Tipcommand[i].compareTo("(") == 0 || Tipcommand[i].compareTo(")") == 0 ) {
tip_point = 0;
}
}
tip_point++;
if(tip_point > 1) {
Tipcode1 = 8;
}
}
if(Tipcode1 == 0 && tipcommand2.compareTo(")") == 0) {
int tip_right_bracket = 0;//右括號匹配數，主要用於右括號
for(int i = 0;i < tip_i;i++) {
if(Tipcommand[i].compareTo("(") == 0) {
tip_right_bracket++;
}
if(Tipcommand[i].compareTo(")") == 0) {
tip_right_bracket--;
}
}
if(tip_right_bracket == 0) {
Tipcode1 = 10;
}
}
if(Tipcode1 == 0 && tipcommand2.compareTo("=") == 0) {
int tip_bracket = 0; //括號匹配數，主要用於左括號
for(int i = 0;i < tip_i;i++) {
if(Tipcommand[i].compareTo("(") == 0) {
tip_bracket++;
}
if(Tipcommand[i].compareTo(")") == 0) {
tip_bracket--;
}
}
if(tip_bracket > 0) {
Tipcode1 = 9;
bracket = tip_bracket;
} else if(tip_bracket == 0) {
if("√^sincostanloglnn!".indexOf(tipcommand1) != -1) {
Tipcode1 = 6;
}
if("+-×÷".indexOf(tipcommand1) != -1) {
Tipcode1 = 5;
}
}
}
if(tipcommand2.compareTo("MC") == 0) Tipcode2 = 1;
if(tipcommand2.compareTo("C") == 0) Tipcode2 = 2;
if(tipcommand2.compareTo("DRG") == 0) Tipcode2 = 3;
if(tipcommand2.compareTo("Bksp") == 0) Tipcode2 = 4;
if(tipcommand2.compareTo("sin") == 0) Tipcode2 = 5;
if(tipcommand2.compareTo("cos") == 0) Tipcode2 = 6;
if(tipcommand2.compareTo("tan") == 0) Tipcode2 = 7;
if(tipcommand2.compareTo("log") ==0) Tipcode2 = 8;
if(tipcommand2.compareTo("ln") == 0) Tipcode2 = 9;
if(tipcommand2.compareTo("n!") == 0) Tipcode2 = 10;
if(tipcommand2.compareTo("√") == 0) Tipcode2 = 11;
if(tipcommand2.compareTo("^") == 0) Tipcode2 = 12;
TipShow(bracket , Tipcode1 , Tipcode2 , tipcommand1 , tipcommand2);
}
/*
* 反饋Tip信息，加強人機交互，與TipChecker()配合使用
*/
private void TipShow(int bracket , int tipcode1 , int tipcode2 ,
String tipcommand1 , String tipcommand2) {
String tipmessage = "";
if(tipcode1 != 0) tip_lock = false;
switch(tipcode1) {
/*case -1:
tipmessage = tipcommand2 + " 不能作爲第一個算符n";
break;
case 1:
tipmessage = tipcommand1 + " 後應輸入：數字/(/./-/函數 n";
break;
case 2:
tipmessage = tipcommand1 + " 後應輸入：)/算符 n";
break;
case 3:
tipmessage = tipcommand1 + " 後應輸入：)/數字/算符 n";
break;
case 4:
tipmessage = tipcommand1 + " 後應輸入：)/./數字 /算符 n";
break;
case 5:
tipmessage = tipcommand1 + " 後應輸入：(/./數字/函數 n";
break;
case 6:
tipmessage = tipcommand1 + " 後應輸入：(/./數字 n";
break;
case 7:
tipmessage = tipcommand1 + " 後應輸入：(/./數字 n";
break;
case 8:
tipmessage = "小數點重複n";
break;*/
case 9:
tipmessage = "不能計算，缺少 "+ bracket +" 個 )";
break;
/*case 10:
tipmessage = "不需要 )";
break;*/
}
switch(tipcode2) {
/*case 1:
tipmessage = tipmessage + "[MC 用法: 清除記憶 MEM]";
break;
case 2:
tipmessage = tipmessage + "[C 用法: 歸零]";
break;
case 3:
tipmessage = tipmessage + "[DRG 用法: 選擇 DEG 或 RAD]";
break;
case 4:
tipmessage = tipmessage + "[Bksp 用法: 退格]";
break;*/
case 5:
tipmessage = tipmessage + "sin 函數用法示例：n" +
"DEG：sin30 = 0.5 RAD：sin1 = 0.84n" +
"注：與其他函數一起使用時要加括號，如：n" +
"sin(cos45)，而不是sincos45" ;
break;
case 6:
tipmessage = tipmessage + "cos 函數用法示例：n" +
"DEG：cos60 = 0.5 RAD：cos1 = 0.54n" +
"注：與其他函數一起使用時要加括號，如：n" +
"cos(sin45)，而不是cossin45" ;
break;
case 7:
tipmessage = tipmessage + "tan 函數用法示例：n" +
"DEG：tan45 = 1 RAD：tan1 = 1.55n" +
"注：與其他函數一起使用時要加括號，如：n" +
"tan(cos45)，而不是tancos45" ;
break;
case 8:
tipmessage = tipmessage + "log 函數用法示例：n" +
"log10 = log(5+5) = 1n" +
"注：與其他函數一起使用時要加括號，如：n" +
"log(tan45)，而不是logtan45" ;
break;
case 9:
tipmessage = tipmessage + "ln 函數用法示例：n" +
"ln10 = le(5+5) = 2.3 lne = 1n" +
"注：與其他函數一起使用時要加括號，如：n" +
"ln(tan45)，而不是lntan45" ;
break;
case 10:
tipmessage = tipmessage + "n! 函數用法示例：n" +
"n!3 = n!(1+2) = 3×2×1 = 6n" +
"注：與其他函數一起使用時要加括號，如：n" +
"n!(log1000)，而不是n!log1000" ;
break;
case 11:
tipmessage = tipmessage + "√ 用法示例：開任意次根號n" +
"如：27開3次根爲 27√3 = 3n" +
"注：與其他函數一起使用時要加括號，如：n" +
"(函數)√(函數) ， (n!3)√(log100) = 2.45";
break;
case 12:
tipmessage = tipmessage + "^ 用法示例：開任意次平方n" +
"如：2的3次方爲 2^3 = 8n" +
"注：與其他函數一起使用時要加括號，如：n" +
"(函數)√(函數) ， (n!3)^(log100) = 36";
break;
}
tip.setText(tipmessage);
}
/*
* 整個計算核心，只要將表達式的整個字符串傳入calc().process()就可以實行計算了
* 算法包括以下幾部分：
* 1、計算部分 process(String str) 當然，這是建立在查錯無錯誤的情況下
* 2、數據格式化 FP(double n) 使數據有相當的精確度
* 3、階乘算法 N(double n) 計算n!，將結果返回
* 4、錯誤提示 showError(int code ,String str) 將錯誤返回
*/
public class calc {
public calc(){
}
final int MAXLEN = 500;
/*
* 計算表達式
* 從左向右掃描，數字入number棧，運算符入operator棧
* +-基本優先級爲1，×÷基本優先級爲2，log ln sin cos tan n!基本優先級爲3，√^基本優先級爲4
* 括號內層運算符比外層同級運算符優先級高4
* 當前運算符優先級高於棧頂壓棧，低於棧頂彈出一個運算符與兩個數進行運算
* 重複直到當前運算符大於棧頂
* 掃描完後對剩下的運算符與數字依次計算
*/
public void process(String str) {
int weightPlus = 0, topOp = 0, topNum = 0, flag = 1, weightTemp = 0;
//weightPlus爲同一（）下的基本優先級，weightTemp臨時記錄優先級的變化
//topOp爲weight[]，operator[]的計數器；topNum爲number[]的計數器
//flag爲正負數的計數器，1爲正數，-1爲負數
int weight[]; //保存operator棧中運算符的優先級，以topOp計數
double number[]; //保存數字，以topNum計數
char ch, ch_gai, operator[];//operator[]保存運算符，以topOp計數
String num;//記錄數字，str以+-×÷()sctgl!√^分段，+-×÷()sctgl!√^字符之間的字符串即爲數字
weight = new int[MAXLEN];
number = new double[MAXLEN];
operator = new char[MAXLEN];
String expression = str;
StringTokenizer expToken = new StringTokenizer(expression,"+-×÷()sctgl!√^");
int i = 0;
while (i < expression.length()) {
ch = expression.charAt(i);
if (i == 0) {
if (ch == '-') flag = -1;
} else if(expression.charAt(i-1) == '(' && ch == '-') flag = -1;
if (ch <= '9' && ch >= '0'|| ch == '.' || ch == 'E') {
num = expToken.nextToken();
ch_gai = ch;
while (i < expression.length() &&
(ch_gai <= '9' && ch_gai >= '0'|| ch_gai == '.' || ch_gai == 'E'))
ch_gai = expression.charAt(i++);
if (i >= expression.length()) i-=1; else i-=2;
if (num.compareTo(".") == 0) number[topNum++] = 0;
else {
number[topNum++] = Double.parseDouble(num)*flag;
flag = 1;
}
}
if (ch == '(') weightPlus+=4;
if (ch == ')') weightPlus-=4;
if (ch == '-' && flag == 1 || ch == '+' || ch == '×'|| ch == '÷' ||
ch == 's' ||ch == 'c' || ch == 't' || ch == 'g' || ch == 'l' ||
ch == '!' || ch == '√' || ch == '^') {
switch (ch) {
case '+':
case '-':
weightTemp = 1 + weightPlus;
break;
case '×':
case '÷':
weightTemp = 2 + weightPlus;
break;
case 's':
case 'c':
case 't':
case 'g':
case 'l':
case '!':
weightTemp = 3 + weightPlus;
break;
//case '^':
//case '√':
default:
weightTemp = 4 + weightPlus;
break;
}
if (topOp == 0 || weight[topOp-1] < weightTemp) {
weight[topOp] = weightTemp;
operator[topOp] = ch;
topOp++;
}else {
while (topOp > 0 && weight[topOp-1] >= weightTemp) {
switch (operator[topOp-1]) {
case '+':
number[topNum-2]+=number[topNum-1];
break;
case '-':
number[topNum-2]-=number[topNum-1];
break;
case '×':
number[topNum-2]*=number[topNum-1];
break;
case '÷':
if (number[topNum-1] == 0) {
showError(1,str_old);
return;
}
number[topNum-2]/=number[topNum-1];
break;
case '√':
if(number[topNum-1] == 0 || (number[topNum-2] < 0 &&
number[topNum-1] % 2 == 0)) {
showError(2,str_old);
return;
}
number[topNum-2] =
Math.pow(number[topNum-2], 1/number[topNum-1]);
break;
case '^':
number[topNum-2] =
Math.pow(number[topNum-2], number[topNum-1]);
break;
case 's':
if(drg_flag == true) {
number[topNum-1] = Math.sin((number[topNum-1]/180)*pi);
} else {
number[topNum-1] = Math.sin(number[topNum-1]);
}
topNum++;
break;
case 'c':
if(drg_flag == true) {
number[topNum-1] = Math.cos((number[topNum-1]/180)*pi);
} else {
number[topNum-1] = Math.cos(number[topNum-1]);
}
topNum++;
break;
case 't':
if(drg_flag == true) {
if((Math.abs(number[topNum-1])/90)%2 == 1) {
showError(2,str_old);
return;
}
number[topNum-1] = Math.tan((number[topNum-1]/180)*pi);
} else {
if((Math.abs(number[topNum-1])/(pi/2))%2 == 1) {
showError(2,str_old);
return;
}
number[topNum-1] = Math.tan(number[topNum-1]);
}
topNum++;
break;
case 'g':
if(number[topNum-1] <= 0) {
showError(2,str_old);
return;
}
number[topNum-1] = Math.log10(number[topNum-1]);
topNum++;
break;
case 'l':
if(number[topNum-1] <= 0) {
showError(2,str_old);
return;
}
number[topNum-1] = Math.log(number[topNum-1]);
topNum++;
break;
case '!':
if(number[topNum-1] > 170) {
showError(3,str_old);
return;
} else if(number[topNum-1] < 0) {
showError(2,str_old);
return;
}
number[topNum-1] = N(number[topNum-1]);
topNum++;
break;
}
topNum--;
topOp--;
}
weight[topOp] = weightTemp;
operator[topOp] = ch;
topOp++;
}
}
i++;
}
while (topOp>0) {
switch (operator[topOp-1]) {
case '+':
number[topNum-2]+=number[topNum-1];
break;
case '-':
number[topNum-2]-=number[topNum-1];
break;
case '×':
number[topNum-2]*=number[topNum-1];
break;
case '÷':
if (number[topNum-1] == 0) {
showError(1,str_old);
return;
}
number[topNum-2]/=number[topNum-1];
break;
case '√':
if(number[topNum-1] == 0 || (number[topNum-2] < 0 &&
number[topNum-1] % 2 == 0)) {
showError(2,str_old);
return;
}
number[topNum-2] =
Math.pow(number[topNum-2], 1/number[topNum-1]);
break;
case '^':
number[topNum-2] =
Math.pow(number[topNum-2], number[topNum-1]);
break;
case 's':
if(drg_flag == true) {
number[topNum-1] = Math.sin((number[topNum-1]/180)*pi);
} else {
number[topNum-1] = Math.sin(number[topNum-1]);
}
topNum++;
break;
case 'c':
if(drg_flag == true) {
number[topNum-1] = Math.cos((number[topNum-1]/180)*pi);
} else {
number[topNum-1] = Math.cos(number[topNum-1]);
}
topNum++;
break;
case 't':
if(drg_flag == true) {
if((Math.abs(number[topNum-1])/90)%2 == 1) {
showError(2,str_old);
return;
}
number[topNum-1] = Math.tan((number[topNum-1]/180)*pi);
} else {
if((Math.abs(number[topNum-1])/(pi/2))%2 == 1) {
showError(2,str_old);
return;
}
number[topNum-1] = Math.tan(number[topNum-1]);
}
topNum++;
break;
case 'g':
if(number[topNum-1] <= 0) {
showError(2,str_old);
return;
}
number[topNum-1] = Math.log10(number[topNum-1]);
topNum++;
break;
case 'l':
if(number[topNum-1] <= 0) {
showError(2,str_old);
return;
}
number[topNum-1] = Math.log(number[topNum-1]);
topNum++;
break;
case '!':
if(number[topNum-1] > 170) {
showError(3,str_old);
return;
} else if(number[topNum-1] < 0) {
showError(2,str_old);
return;
}
number[topNum-1] = N(number[topNum-1]);
topNum++;
break;
}
topNum--;
topOp--;
}
if(number[0] > 7.3E306) {
showError(3,str_old);
//input.setText("""+str_old+"": 太大了，我不行了");
return;
}
input.setText(String.valueOf(FP(number[0]))); //輸出最終結果
tip.setText("計算完畢，要繼續請按歸零鍵 C");
mem.setText(str_old+"="+String.valueOf(FP(number[0])));
}
/*
* FP = floating point 控制小數位數，達到精度
* 否則會出現 0.6-0.2=0.39999999999999997的情況，用FP即可解決，使得數爲0.4
* 本格式精度爲15位
*/
public double FP(double n) {
//NumberFormat format=NumberFormat.getInstance(); //創建一個格式化類f
//format.setMaximumFractionDigits(18); //設置小數位的格式
DecimalFormat format = new DecimalFormat("0.#############");
return Double.parseDouble(format.format(n));
}
/*
* 階乘算法
*/
public double N(double n) {
int i = 0;
double sum = 1;
for(i = 1;i <= n;i++) {
sum = sum*i;
}
return sum;
}
/*
* 錯誤提示，按了"="之後，若計算式在process()過程中，出現錯誤，則進行提示
*/
public void showError(int code ,String str) {
String message="";
switch (code) {
case 1:
message = "零不能作除數";
break;
case 2:
message = "函數格式錯誤";
break;
case 3:
message = "值太大了，我不行了";
}
input.setText("""+str+"""+": "+message);
tip.setText(message+"n"+"計算完畢，要繼續請按歸零鍵 C");
}
}
}界面：main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#ff808080"
>
<EditText android:id="@+id/input"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:cursorVisible="false"
android:gravity="right"
android:editable = "false"
android:text="0" />
<TableRow
android:layout_width="fill_parent"
android:layout_height="wrap_content"
>
<TextView android:id="@+id/M"
android:layout_width="53sp"
android:layout_height="wrap_content"
android:text=" MEM :" />
<TextView android:id="@+id/mem"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="0" />
</TableRow>
<TableRow
android:layout_width="fill_parent"
android:layout_height="wrap_content"
>
<TextView android:id="@+id/_drg"
android:layout_width="53sp"
android:layout_height="wrap_content"
android:text=" DEG" />
<Button android:id="@+id/mc"
android:text="MC"
android:layout_width="106sp"
android:layout_height="wrap_content" />
<Button android:id="@+id/c"
android:text="C"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
</TableRow>
<TableRow
android:layout_width="fill_parent"
android:layout_height="wrap_content"
>
<Button android:id="@+id/drg"
android:text="DRG"
android:layout_width="53sp"
android:layout_height="wrap_content" />
<Button android:id="@+id/sin"
android:text="sin"
android:layout_width="53sp"
android:layout_height="wrap_content" />
<Button android:id="@+id/cos"
android:text="cos"
android:layout_width="53sp"
android:layout_height="wrap_content" />
<Button android:id="@+id/tan"
android:text="tan"
android:layout_width="53sp"
android:layout_height="wrap_content" />
<Button android:id="@+id/factorial"
android:text="n!"
android:layout_width="53sp"
android:layout_height="wrap_content" />
<Button android:id="@+id/bksp"
android:text="Bksp"
android:layout_width="53sp"
android:layout_height="wrap_content" />
</TableRow>
<TableRow
android:layout_width="fill_parent"
android:layout_height="wrap_content"
>
<Button android:id="@+id/seven"
android:text="7"
android:layout_width="53sp"
android:layout_height="wrap_content" />
<Button android:id="@+id/eight"
android:text="8"
android:layout_width="53sp"
android:layout_height="wrap_content" />
<Button android:id="@+id/nine"
android:text="9"
android:layout_width="53sp"
android:layout_height="wrap_content" />
<Button android:id="@+id/divide"
android:text="÷"
android:layout_width="53sp"
android:layout_height="wrap_content" />
<Button android:id="@+id/left"
android:text="("
android:layout_width="53sp"
android:layout_height="wrap_content" />
<Button android:id="@+id/right"
android:text=")"
android:layout_width="53sp"
android:layout_height="wrap_content" />
</TableRow>
<TableRow
android:layout_width="fill_parent"
android:layout_height="wrap_content"
>
<Button android:id="@+id/four"
android:text="4"
android:layout_width="53sp"
android:layout_height="wrap_content" />
<Button android:id="@+id/five"
android:text="5"
android:layout_width="53sp"
android:layout_height="wrap_content" />
<Button android:id="@+id/six"
android:text="6"
android:layout_width="53sp"
android:layout_height="wrap_content" />
<Button android:id="@+id/mul"
android:text="×"
android:layout_width="53sp"
android:layout_height="wrap_content" />
<Button android:id="@+id/sqrt"
android:text="√"
android:layout_width="53sp"
android:layout_height="wrap_content" />
<Button android:id="@+id/square"
android:text="^"
android:layout_width="53sp"
android:layout_height="wrap_content" />
</TableRow>
<TableRow
android:layout_width="fill_parent"
android:layout_height="wrap_content"
>
<Button android:id="@+id/one"
android:text="1"
android:layout_width="53sp"
android:layout_height="wrap_content" />
<Button android:id="@+id/two"
android:text="2"
android:layout_width="53sp"
android:layout_height="wrap_content" />
<Button android:id="@+id/three"
android:text="3"
android:layout_width="53sp"
android:layout_height="wrap_content" />
<Button android:id="@+id/sub"
android:text="-"
android:layout_width="53sp"
android:layout_height="wrap_content" />
<Button android:id="@+id/log"
android:text="log"
android:layout_width="53sp"
android:layout_height="wrap_content" />
<Button android:id="@+id/ln"
android:text="ln"
android:layout_width="53sp"
android:layout_height="wrap_content" />
</TableRow>
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="57sp"
>
<TableRow
android:layout_width="fill_parent"
android:layout_height="wrap_content"
>
<Button android:id="@+id/zero"
android:text="0"
android:layout_width="53sp"
android:layout_height="wrap_content" />
<Button android:id="@+id/dot"
android:text="."
android:layout_width="53sp"
android:layout_height="wrap_content" />
<Button android:id="@+id/equal"
android:text="="
android:layout_width="53sp"
android:layout_height="wrap_content" />
<Button android:id="@+id/add"
android:text="+"
android:layout_width="53sp"
android:layout_height="wrap_content" />
<Button android:id="@+id/exit"
android:text="exit"
android:layout_width="106sp"
android:layout_height="wrap_content" />
</TableRow>
</TableLayout>
<TableRow
android:layout_width="fill_parent"
android:layout_height="wrap_content"
>
<TextView android:id="@+id/T"
android:layout_width="45sp"
android:layout_height="wrap_content"
android:text=" TIP :" />
<TextView android:id="@+id/tip"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Welcome" />
</TableRow>
</LinearLayout>strings.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="app_name">Calculator</string>
<dimen name="layout_width">250px</dimen>
<dimen name="btn_con_length">65px</dimen>
<dimen name="btn_con_marginLeft">55px</dimen>
<dimen name="btn_length">50px</dimen>
</resources>AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.android.calculator"
android:versionCode="1"
android:versionName="1.0">
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".Calculator"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
<uses-sdk android:minSdkVersion="5" />
</manifest>