干支、生肖查询器 v3.0（增加公元前年份的查询）

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//main.cpp//***************************************
//*程序名：判断干支与生肖    
//*功  能：输入公元纪年，判断干支与生肖 
//*编制人：刘聪          
//*创建时间：2017年1月24日
//*修改时间：2017年9月22日（v2.0）（v3.0） 
//***************************************
#include <iostream>  
#include <cstring>
#include <cstdlib>
#include "class.h"
using namespace std;  int main()  
{    int GetInteger();void JudgeYear(int year);cout << "***********************************************************" << endl << endl; while(1){cout << "正数代表公元后，负数代表公元前。" << "请输入需要判断的年号：";  int year = GetInteger();cout << endl;if(year == 0){system("pause");  return 0;  }else{if(year > 0){JudgePositive obj;obj.JudgeYear(year);cout << endl;cout << "***********************************************************" << endl; cout << endl << "若要退出程序，请直接按数字0；否则请继续输入。" << endl << endl;	}else{JudgeNegative obj;obj.JudgeYear(year);cout << endl;cout << "***********************************************************" << endl; cout << endl << "若要退出程序，请直接按数字0；否则请继续输入。" << endl << endl;}}}return 0;  
}  int GetInteger(){    char buf[100] = {0};    while(strlen(buf) == 0)  //用户直接输入回车     cin.getline(buf, 100);    return atoi(buf);  //atoi函数是cstring头文件自带的     
}

//class.h#ifndef class_h
#define class_hclass Judge{
public:virtual void JudgeYear(int year) = 0;
};class JudgePositive:public Judge{
public:void JudgeYear(int year);
};class JudgeNegative:public Judge{
public:void JudgeYear(int year);
};#endif

//class.cpp#include <iostream>
#include "class.h"
using namespace std;void JudgePositive::JudgeYear(int year){int a, b, c;a = year % 10 + 7;if(a > 10) a = a - 10; c = b = year % 12 + 9;if(b > 12) c = b = b - 12;  cout << year << "年是‘";  switch( a ){  case 1:cout<<"甲";break;  case 2:cout<<"乙";break;  case 3:cout<<"丙";break;  case 4:cout<<"丁";break;  case 5:cout<<"戊";break;  case 6:cout<<"己";break;  case 7:cout<<"庚";break;  case 8:cout<<"辛";break;  case 9:cout<<"壬";break;  case 10:cout<<"癸";break;  default:;break;  }  switch( b ){  case 1:cout<<"子";break;  case 2:cout<<"丑";break;  case 3:cout<<"寅";break;  case 4:cout<<"卯";break;  case 5:cout<<"辰";break;  case 6:cout<<"巳";break;  case 7:cout<<"午";break;  case 8:cout<<"未";break;  case 9:cout<<"申";break;  case 10:cout<<"酉";break;  case 11:cout<<"戌";break;  case 12:cout<<"亥";break;  default:;break;  }   switch( c ){  case 1:cout<<"鼠";break;  case 2:cout<<"牛";break;  case 3:cout<<"虎";break;  case 4:cout<<"兔";break;  case 5:cout<<"龙";break;  case 6:cout<<"蛇";break;  case 7:cout<<"马";break;  case 8:cout<<"羊";break;  case 9:cout<<"猴";break;  case 10:cout<<"鸡";break;  case 11:cout<<"狗";break;  case 12:cout<<"猪";break;  default:;break;  }  cout<<"年’。";  
}void JudgeNegative::JudgeYear(int year){int a, b, c;a = year % 10 - 7;if(a < -10) a = a + 10; c = b = year % 12 - 9;if(b < -12) c = b = b + 12;  cout << year << "年是‘";  switch( a ){  case -1:cout<<"丁";break;  case -2:cout<<"丙";break;  case -3:cout<<"乙";break;  case -4:cout<<"甲";break;  case -5:cout<<"癸";break;  case -6:cout<<"壬";break;  case -7:cout<<"辛";break;  case -8:cout<<"庚";break;  case -9:cout<<"己";break;  case -10:cout<<"戊";break;  default:;break;  }  switch( b ){  case -1:cout<<"巳";break;  case -2:cout<<"辰";break;  case -3:cout<<"卯";break;  case -4:cout<<"寅";break;  case -5:cout<<"丑";break;  case -6:cout<<"子";break;  case -7:cout<<"亥";break;  case -8:cout<<"戌";break;  case -9:cout<<"酉";break;  case -10:cout<<"申";break;  case -11:cout<<"未";break;  case -12:cout<<"午";break;  default:;break;  }   switch( c ){  case -1:cout<<"蛇";break;  case -2:cout<<"龙";break;  case -3:cout<<"兔";break;  case -4:cout<<"虎";break;  case -5:cout<<"牛";break;  case -6:cout<<"鼠";break;  case -7:cout<<"猪";break;  case -8:cout<<"狗";break;  case -9:cout<<"鸡";break;  case -10:cout<<"猴";break;  case -11:cout<<"羊";break;  case -12:cout<<"马";break;  default:;break;  }  cout<<"年’。";  
}