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第一篇：c++24點游戲

c++24點游戲

#include “iostream” #include “string” using namespace std;

//定義Stack類

const maxsize=20;

enum Error_code { success, overflow, underflow };

template class Stack { public: Stack();

bool empty()const;bool full()const;int size()const;void clear();

Error_code top(T &item)const;Error_code pop();

Error_code push(const T &item);private: int count;T entry[maxsize];};

template Stack::Stack(){ count=0;}

template

bool Stack::empty()const { return count==0;}

template

bool Stack::full()const { return count==maxsize;}

template int Stack::size()const { return count;}

template void Stack::clear(){ count=0;}

template

Error_code Stack::top(T &item)const { if(empty())return underflow;item= entry[count-1];return success;}

template

Error_code Stack::pop(){ if(empty())return underflow;count--;return success;}

template

Error_code Stack::push(const T &item){ if(full())return overflow;entry[count++]=item;return success;}

Stack sign;Stack num;

int set;

// 判斷程序中的異常，以便適時退出？//

void process(char c)

//計算兩個數的 +-* / 運算// { int k=0;double a,b;sign.pop();

if(num.top(b)==success){

num.pop();

if(num.top(a)==success){ num.pop();k=1;} } if(k){ switch(c){

case '+': num.push(a+b);break;case '-': num.push(a-b);break;case '*': num.push(a*b);break;case '/': if(b==0){ set=4;num.push(-1);} else

num.push(a/b);break;} }

else {set=1;num.push(-1);} }

void get_command(string &str){

cout<<“n請輸入要進行運算的表達式,包括” +,-,*,/,=,(,)“和數字,”<

<<“注意: 以數字開頭,等號結尾,中間括號要匹配.”<>str;}

double do_command(const string &str){ string s=“";

double outcome=-1;char c;

for(int i=0;str[i]!='