没有注释且有死循环:
// Game.cpp : Defines the entry point for the console application.
//
#include <math.h>
#include <stdio.h>
#include <iostream>
using namespace std;
enum Result
{win,loss,draw};
enum Show{scissors,stone,cloth};
struct CPerson
{
Show isWin;
CPerson(Show res)
{
isWin = res;
};
Result IsWin( CPerson b)
{
Result res ;
switch(abs((int)this->isWin - (int)b.isWin))
{
case 0:
res = (Result)2;
break;
case 1:
if((int)this->isWin > (int)b.isWin)
res = (Result)0;
else
res = (Result)1;
break;
case 2:
if((int)this->isWin > (int)b.isWin)
res = (Result)1;
else
res = (Result)0;
break;
default :
break;
}
return res;
};
};
int main()
{
cout<<"---------------------"<<endl;
cout<<"please input two int mumbers ,it must be more equal 0 and less equal 2."<<endl;
cout<<"0 is scissors,1 is stone,and 2 is cloth."<<endl;
int a,b;
a= -1;b=-1;
while(!(a>=0&&a<=2&&b<=2&&b>=0))
{
cout<<"please input A:";
cin>>a;
cout<<"please input B:";
cin>>b;
}
CPerson personA((Show)a);
CPerson personB((Show)b);
Result result;
result = personA.IsWin(personB);
if(result == (Result)0)
cout<<"A Win!"<<endl;
else if(result == (Result)1)
cout<<"B Win!"<<endl;
else
cout<<"draw"<<endl;
cout<<"---------------------"<<endl;
return 0;
}
修改后(加注释后的):
// Game.cpp : Defines the entry point for the console application.
//
#include <math.h>
#include <stdio.h>
#include <iostream>
using namespace std;
enum Result{win,loss,draw}; // the result of playing the game
enum Show{scissors,stone,cloth}; //剪刀,石头,布
struct CPerson
{
Show m_show; //the person's show. it must be Show enum variable.
CPerson(Show show)
{
m_show = show;
};
};
//IsWin function return personA's result.
Result IsWin(CPerson a ,CPerson b)
{
Result res ;
switch(abs(a.m_show - b.m_show))
{
case 0: //personA and personB are equal.
res = draw;
break;
case 1://personA and PersonB are closed.
if(a.m_show > b.m_show)
res = win;
else
res = loss;
break;
case 2: //personA and personB are distant.
if(a.m_show > b.m_show)
res = loss;
else
res = win;
break;
default :
break;
}
return res;
};
int main()
{
cout<<"---------------------"<<endl;
cout<<"please input two int mumbers ,it must be more equal 0 and less equal 2."<<endl;
cout<<"0 is scissors,1 is stone,and 2 is cloth."<<endl;
int a,b;
a= -1;b=-1;
while(!(a>=0&&a<=2&&b<=2&&b>=0))
{
cout<<"please input A:";
cin>>a;
cout<<"please input B:";
cin>>b;
}
CPerson personA((Show)a);
CPerson personB((Show)b);
Result result;
result = IsWin(personA,personB);
if(result == (Result)0)
cout<<"A Win!"<<endl;
else if(result == (Result)1)
cout<<"B Win!"<<endl;
else
cout<<"draw"<<endl;
cout<<"---------------------"<<endl;
return 0;
}
可是如果输入字符还是死循环..............
最后的终于正确了的:
主要是要检查cin的结果,用cin.good()或cin.fail()
用cin.clear() 和fflush(stdin) 来重新初始化cin .........以下是新的代码:
// Game.cpp : Defines the entry point for the console application.
//
#include <math.h>
#include <stdio.h>
#include <iostream>
using namespace std;
enum Result{win,loss,draw}; // the result of playing the game
enum Show{scissors,stone,cloth}; //剪刀,石头,布
struct CPerson
{
Show m_show; //the person's show. it must be Show enum variable.
CPerson(Show show)
{
m_show = show;
};
};
//IsWin function return personA's result.
Result IsWin(CPerson a ,CPerson b)
{
Result res ;
switch(abs(a.m_show - b.m_show))
{
case 0: //personA and personB are equal.
res = draw;
break;
case 1://personA and PersonB are closed.
if(a.m_show > b.m_show)
res = win;
else
res = loss;
break;
case 2: //personA and personB are distant.
if(a.m_show > b.m_show)
res = loss;
else
res = win;
break;
default :
break;
}
return res;
};
int main()
{
cout<<"---------------------"<<endl;
cout<<"please input two int mumbers ,it must be more equal 0 and less equal 2."<<endl;
cout<<"0 is scissors,1 is stone,and 2 is cloth."<<endl;
int a,b;
a= -1;b=-1;
while(1)
{
cin.clear();
fflush(stdin);
cout<<"input A"<<endl;
cin>>a;
if(!(a>=0&&a<=2)||!cin.good())
{
cerr<<"input error!"<<endl;
continue;
}
cout<<"input B"<<endl;
cin>>b;
if(!(b>=0&&b<=2)||!cin.good())
{
cerr<<"input error!"<<endl;
continue;
}
CPerson personA((Show)a);
CPerson personB((Show)b);
Result result;
result = IsWin(personA,personB);
if(result == (Result)0)
cout<<"A Win!"<<endl;
else if(result == (Result)1)
cout<<"B Win!"<<endl;
else
cout<<"draw"<<endl;
cout<<"---------------------"<<endl;
}
return 0;
}