干支、生肖查询器 v3.0（增加公元前年份的查询）

//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_h

class 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’。";
}