跪求小游戏源代码(C++)

我给你做了一个 锤子剪子布的猜拳游戏.0为推出 1为锤子 2为剪子3为布...
刚写完,加分啊
#include <iostream>
#include <time.h>
#include <stdlib.h>
using namespace std;
int main()
{
int a,b;
srand( time(NULL));
cout<<"shuchu 1-3"<<endl;
cout<<"0--exit"<<endl;
cout<<"1--chui zi"<<endl;
cout<<"2--jian zi"<<endl;
cout<<"3--bu"<<endl<<endl;
while (1)
{

a=rand()%3+1;
cout<<"shuchu 1-3"<<endl;
cout<<"0--exit"<<endl;
cout<<"1--chui zi"<<endl;
cout<<"2--jian zi"<<endl;
cout<<"3--bu"<<endl<<endl;
cin>>b;
if(b!=1||b!=2||b!=3||b!=0)
{
cout<<"cuo wu!"<<endl;