一日午晌，顿觉百无聊赖，阵阵哈切之余，竟忆起儿时游玩之小游戏，名曰“猜数字”，此物规则甚是简单，游玩之时仅需猜测一四位数字，接着便可得到相应之正误结果，然后依此继续猜测，如此周而复始，直至猜测功成。
如诸位看官依然不甚了了亦无甚大碍，容我在此以一简单示例剖析之：
譬有一数字1234，游玩者之目的即将其猜出，游戏伊始，游玩之人自不知其所需猜测之数字为何，故其可能胡诌一数字，譬如4253，此猜测数字较之原数字而言，大抵有以下之特点，第一便是数字2，其出现于原数字之中，亦出现于猜测之数之中，并且其所在位置亦相同，皆在百位，故此数可谓之精准匹配，称其为A类型数字；与之相比，数字3虽亦出现于原数字及猜测数字之中，然其位置并不相同，一个处十位，一个处个位，此类数字可谓之次准匹配，称其为B类型数字，故猜测者报出4253之猜测时，其会得到1A1B之反馈，意为猜测数字之中共有一个A类型之数字、一个B类型之数字，猜测之人依此结果继续猜测，直至猜出，一般而言，猜测次数最少之人获胜，有时亦可纳入时间限制之考量。
现时思量一番，与其无聊，不如编写个“猜数字”以期自娱自乐，以免大好韶华匆匆而逝，老大来追悔莫及，既然如此，何不马上动手，图形界面？鼠标跟踪？此等花哨之事大可不必，黑白一个单调控制台，足矣足矣 :)
在此便列出全部之实现代码，数来也不过区区一百来行，如果看官有意，大可完整复制黏贴并编译之 :) ( 本人所用编译器为MinGW(gcc)，故并不保证在VC中亦可顺利通过，见谅见谅 )
代码语言：javascript复制#include <iostream>
using std::ostream;
using std::endl;
using std::cout;
using std::cin;
const int NUMBERS_COUNT = 10;//0~9
const int NUMBERS_GUESS = 4;//guess number consist of 4 number
int g_count[NUMBERS_COUNT];//store the counts of numbers (0~9)
int g_buffer[NUMBERS_COUNT][NUMBERS_GUESS];//store the value and number
//init g_count and g_buffer array
void Init()
{
for( int i = 0; i < NUMBERS_COUNT; i )
{
g_count[i] = 0;
for( int j = 0; j < NUMBERS_GUESS; j )
{
g_buffer[i][j] = 0;
}
}
}
struct GuessResult
{
int ACount;//the position and value are both right
int BCount;//just the value is right
GuessResult():ACount(0),BCount(0) {};
friend ostream& operator << ( ostream& o, const GuessResult& gr );
};
ostream& operator << ( ostream& o, const GuessResult& gr )
{
cout<<gr.ACount<<" A "<<gr.BCount<<" B ";
}
GuessResult Evaluate( char originNumber[NUMBERS_GUESS 1], char guessNumber[NUMBERS_GUESS 1] )
{
Init();
//get the information of the originNumber
for( int i = 0; i < NUMBERS_GUESS; i )
{
g_count[ originNumber[i]-'0' ];
g_buffer[originNumber[i]-'0'][i] = 1;
}
GuessResult gr;
for( int i = 0; i < NUMBERS_GUESS; i )
{
if( g_buffer[ guessNumber[i]-'0' ][i] == 1 )//position and value are both match
{
gr.ACount;
--g_count[ guessNumber[i]-'0' ];//reduce the count of the number
}
}
for( int i = 0; i < NUMBERS_GUESS; i )
{
if( g_buffer[ guessNumber[i]-'0' ][i] != 1
&& g_count[ guessNumber[i]-'0' ] > 0 )//just value match
{
gr.BCount;
--g_count[ guessNumber[i]-'0' ];
}
}
return gr;
}
void GenGuessNumber( char number[NUMBERS_GUESS 1] )
{
srand( time(NULL) );
for( int i = 0; i < NUMBERS_GUESS; i )
{
int num = rand() % NUMBERS_COUNT;
number[i] = num '0';
}
number[NUMBERS_GUESS] = '/0';
}
int main()
{
char originNumber[NUMBERS_GUESS 1];
char guessNumber[NUMBERS_GUESS 1];
GenGuessNumber( originNumber );
bool isGuessRight = false;
int guessCount = 0;
while( !isGuessRight )
{
cout<<"Please input the number you've guessed : "<<endl;
cin >> guessNumber;
if( Evaluate( originNumber, guessNumber ).ACount == NUMBERS_GUESS )
{
cout<<"You Are Greate!!!"<<endl;
cout<<"You've Guessed "<<guessCount<<" Times ."<<endl;
isGuessRight = true;
}
else
{
cout<<"The Result Is : "<<endl
<<Evaluate( originNumber, guessNumber )<<endl;
guessCount;
}
}
system( "pause" );
return 0;
} 
