编写一个简易计算器的源代码

AStack.h#ifndef ASTACK_HEADER#define ASTACK_HEADER#include <iostream>using namespace std;template <class Elem> class AStack{private:int size;int top;Elem* listArray;public:AStack(){ size = 100; top = 0; listArray = new Elem[100]; }~AStack(){ delete [] listArray; }void clear() { top = 0; }bool push(Elem& item){if (top == size) return false;else { listArray[top++] = item; return true; } }bool pop(Elem& it){if (top == 0) return false;else { it = listArray[--top]; return true; }}bool topValue(Elem& it) const{if (top == 0) return false;else { it = listArray[top - 1]; return true; } }int length() const { return top; }};#endifFunction.cpp#include "function.h"#include "AStack.h"#include <math.h>#include <stdio.h>void calUserInfo(){cout<<"\t* 智能计算器V1.0*"<<endl;cout<<"\t*********************"<<endl;cout<<"\t* 1 * 2 * 3 * + * - *"<<endl;cout<<"\t* 4 * 5 * 6 * * * / *"<<endl;cout<<"\t* 7 * 8 * 9 * 0 * % *"<<endl;cout<<"\t* & * ^ * = * ( * ) *"<<endl;cout<<"\t*********************"<<endl; }int isp(char& ch){switch(ch){case '=':return 0;break;case '+':case '-':return 3;break;case '*':case '/':case '%':return 5;case '(':return 1;break;case ')':return 8;break;case '^':case '&':return 7;break;}}int osp(char& ch) {switch(ch) {case '=':return 0;break;case '+':case '-':return 2;break;case '*':case '/':case '%':return 4;break;case '(':return 8;break;case ')':break;case '^':case '&':return 6;break;}}double extract(double x,double y){return pow(x,1/y);}bool cal(char op, double x, double y, double& r) {int o = 0;switch(op){case '-':r = x - y;break;case '+':r = x + y;break;case '/':r = x / y;break;case '%':(int) o = (int)x % (int)y;r = (double)o;break;case '*':r = x * y;case '&':r = extract(x,y);break;case '^':r = pow(x,y);break;}return true;}bool isDigit(char ch){if (((int)ch >= 48) && ((int)ch <= 57))return true;else return false;}bool isPoint(char ch){if (ch == '.')return true;else return false;}bool isOperator(char ch){if ((ch == '=') || (ch == '-') || (ch == '+') || (ch == '(') || (ch == ')') || (ch == '*') || (ch == '&') ||(ch == '/') ||(ch == '%') ||(ch == '^'))return true;else return false;}double turnDigit(char ch){double value;value = (double)ch - 48;return value;}double newDigit(double prior_digit, double now_digit, bool isHavePoint, double point_num){double value;if(!isHavePoint){value = prior_digit*10 + now_digit;}else{value = prior_digit + now_digit/(pow(10,point_num));}return value;}Function.h#ifndef FUNCTION_HEADER#define FUNCTION_HEADER//友好的用户界面void calUserInfo();//用于记录处于栈内的优先级int isp(char& ch);//用于记录栈外的优先级int osp(char& ch);//相当于value = x op y;如果cal成功，然后将value的值返回r，用r来保存bool cal(char op, double x, double y, double& r);//判断是否为字符bool isDigit(char ch);//判断是否为小数点bool isPoint(char ch);//判断是否为操作运算符bool isOperator(char ch);//将数字的字符状态转化成double状态double turnDigit(char ch);//如果几个数字或加一个小数点连在一起，这说明他们是同一个数字的不同位数，此函数将不同连在一起的数字//组成新的数字double newDigit(double prior_digit, double now_digit, bool isHavePoint, double point_num);#endifMain.cpp#include "AStack.h"#include "function.h"#include <iostream>#include <stdlib.h>#include <string.h>using namespace std;int main(){char str[100] = "\0";AStack<double> opnd; //用于存放数据AStack<char> optr; //用于存放操作符char now_ch = '='; //用于记录当前字符char prior_ch = '\0'; //用于记录前一个字符double now_dig = 0; //用于记录当前一个数字double prior_dig = 0; //用于记录前一个数字double value = 0; //用于存放计算后的值bool point = false; //用于判断是否有小数点int point_num = 1; //用于记录数字后面的小数点位数char topValue; //用于记录opnd的top上的值char option = 'Y'; //用于判断是否要继续运算do{prior_dig = 0; //在opnd中提前放一个0now_ch = '=';opnd.push(prior_dig);optr.push(now_ch);system("cls");calUserInfo();cout << "请输入表达式(以等号结束):" << endl;cin >> str;bool exitPoint = false;/*对每个字符的处理*/for(int i = 0; i < strlen(str); i++){now_ch = str[i];/*判断是不是数字以及相关操作*/if (isDigit(now_ch)){now_dig = turnDigit(now_ch);if (isDigit(prior_ch)){opnd.pop(prior_dig);if(exitPoint){point = true;now_dig = newDigit(prior_dig, now_dig,point,point_num);point_num++;}elsenow_dig = newDigit(prior_dig, now_dig,point,point_num);}if(isPoint(prior_ch)){opnd.pop(prior_dig);now_dig = newDigit(prior_dig, now_dig,point,point_num);exitPoint = true;point_num++;}value = now_dig;opnd.push(now_dig);prior_ch = now_ch;}/*判断是不是小数点以及相关操作*/else if (isPoint(now_ch)){point = true;prior_ch = now_ch;}/*判断是不是操作符以及相关操作*/else if (isOperator(now_ch)){/*对用于数字操作的相关标记量进行清空，方便下一次数字操作*/point = false;point = 0;exitPoint = false;point_num = 1;/*看optr中是否有操作符存在，若不存在，则只放一个操作符进去*//* 但不进行任何操作*/if(optr.length() <= 1){optr.push(now_ch);prior_ch = now_ch;}/*optr已有操作符存在的话，开始进行优先级的比较*/else{optr.pop(topValue);/* 栈内优先级小于栈外优先级*/if(isp(topValue) < osp(now_ch)){optr.push(topValue);optr.push(now_ch);prior_ch = now_ch;}/*栈内优先级大于栈外优先级*/else if(isp(topValue) > osp(now_ch)){if(now_ch == ')' && topValue == '('){break;}do{double x = 1,y = 0;opnd.pop(x);opnd.pop(y);if( cal(topValue,y,x,value) ){opnd.push(value);}if(!optr.pop(topValue))break;}while(isp(topValue) > osp(now_ch));// if((topValue != '('))if (now_ch != ')'){optr.push(topValue);optr.push(now_ch);}prior_ch = now_ch;}/*其他情况报错*/elsebreak;}}/*其他情况报错*/elsecout << "输入的表达式错误，请检查!" << endl; }optr.pop(prior_ch);/*打印最后的计算值*/if(prior_ch == '='){cout << "最终得出的数据为: " << value << endl;}elsecout << "输入的表达式错误，请检查!" << endl;/*判断是否还要继续*/cout << "是否继续? ,继续'Y'/结束'N' :" << endl;cin >> option;/*清空数字栈和操作符栈*/opnd.clear();optr.clear();}while(option == 'Y');return 0;}。