c++编写手机幼儿10以内加法练习软件两个加数随机产生并且其和小于10

int main()
{
    int score=0;
    for(int i=0;i<10;i++)
    {
        int sum;
        srand((unsigned int)time(NULL));
        int a=rand()%10+1;
        int b=rand()%(9-a)+1;
        cout<        cin>>sum;
        if(sum==(a+b))
        {
            score++;
            cout<<"正确,当前得分："<        }
        else 
        {
            cout<<"错误,正确答案为"<            cout<<"当前得分："<        }
    }
    cout<<"总得分为："<    
    return 0;
}