Question

所以，我有一个项目，我的一个类方法应该popque前面的deque，mydeque。当我在main中调用one.play（）并运行程序时，它不会弹出deque。该程序应该让用户输入他们想要的卡数，然后每次拉出一张卡时生成一个随机数，并比较卡上的值。如果随机数小于卡号，则分数增加1。但是为了使它工作，我需要弹出双端队列的前面，并且每次都将新号码与双端队列的新前线进行比较。

#include <iostream>
#include <deque>
using namespace std;

class Player {

    private:


            size_t cards;
            deque<int> mydeque;
    public:
            string name;
            int score;

            Player(string player) {
                    name = player;
                    score = 0;

            }

            void recieve(size_t card){

               mydeque.push_front (card);
            }
            int play() {
                    return mydeque.front();
                    mydeque.pop_front();
            }

            ~Player() {
                    name = " ";
                    score = 0;
            }
            void tostring(ostream & out) const{

                    out << "player name : "<< name << endl;
                    out << "score : " << score << endl;
                    out << "cards : " << mydeque.size() << endl;
                    for(int i =0; i <mydeque.size();i++)
                            out << mydeque[i] << " " ;                       
            }

};

            ostream & operator <<(ostream & out, const Player & p){
                    p.tostring(out);
                    return out;}

int main () {
    int rounds;
    cout << "Give the number of rounds: "<<endl;
    cin >> rounds;
    Player one("some player");
    for (int i = 1; i < rounds+1; i++){
            one.recieve(i);

    }


    for( int i = 0; i < rounds; i++) {
            one.play();
            int randnum = rand()%(rounds-1 + 1) + 1;

            cout << one << endl;
            cout << " The dealer draws : " << randnum << endl;

 if (randnum < one.play()){
                    one.score = one.score + 1;}}



    return 0;

}

Answer 1

执行import java.util.Scanner; public class TwoNumbers { public static void main(String[] args) { int a; int b; Scanner in = new Scanner(System.in); // Keep prompting the user until the input is correct do { System.out.println("Enter two positive integers, the first smaller than the second."); System.out.print("First: "); a = in.nextInt(); System.out.print("Second: "); b = in.nextInt(); } while(a > b); // Only print this when the input is correct System.out.println("You entered " + a + " and " + b); } }语句后，函数结束。

变化：

return

要：

int play() {
    return mydeque.front();
    mydeque.pop_front();
}

当我调用告诉它的方法时，为什么我的双端队列不会pop_front？

1 个答案: