숫자야구게임 
~cpp
#include <iostream>
#include <ctime>
using namespace std;
void main()
{
srand(time(0));
int x1 = rand() % 10;
int x2 = rand() % 10;
while ( x2 == x1 )
x2 = rand() % 10;
int x3 = rand() % 10;
while ( x3 == x1 || x3 == x2)
x3 = rand() % 10;
cout << x1 << x2 << x3 << "\n";
cout << "숫자 세개를 입력하세요. : ";
int a,b,c;
cin >> a >> b >> c;
int strike = 0;
int ball = 0;
while( !(x1 == a && x2 == b && x3 == c))
{
if ( x1 == a )
strike++;
if ( x2 == b )
strike++;
if ( x3 == c )
strike++;
if ( x1 == b || x1 == c)
ball++;
if ( x2 == a || x2 == c)
ball++;
if ( x3 == a || x3 == b)
ball++;
cout << strike << " strike, " << ball << "ball\n";
strike = 0;
ball = 0;
cout << "숫자 세개를 입력하세요. : ";
cin >> a >> b >> c;
}
}