求解 “ 如何在输入的同时实现倒计时功能 ”

Question

预期结果： 在输入的同时能够倒计时，如果计时结束还未输入完成验证码，则关闭；如果输入正确，则也关闭。（有三次机会）
想法：在主函数调用，但是不能够同时操作

代码如下：

#include<iostream>
#include<time.h>
#include<string>
#include<Windows.h>
#include<conio.h>
using namespace std;


void Getnum();    //得到验证码
void Input(char check_num[]);  //输入验证码
void Compare(char give_num[], char give_num_s[]); //判断是否输入正确
void Fobmit(); //禁止输入，并开始倒计时
void CleanScreen();  //清屏


int give_num[4];
char give_num_s[4];
int frequency = 1;
int j = 2;
char check_num[4];


int main(){
    srand(time(NULL));
    SetConsoleTitleA("验证码");
    int start_time = time(0);
    Getnum();
    Input(check_num);
}


void Getnum() {
    if(frequency <=2){
        cout << "您收到的验证码是：" << "";
        for (int i = 0; i < 1; i++) {
            give_num[i] = rand() % 26;
        }
        for (int i = 1; i < 2; i++) {
            give_num[i] = rand() % 26;
        }
        for (int i = 2; i < 4; i++) {
            give_num[i] = rand() % 10;
        }
        for (int i = 0; i < 1; i++) {
            give_num_s[i] = 'A' + give_num[i];
        }
        for (int i = 1; i < 2; i++) {
            give_num_s[i] = 'a' + give_num[i];
        }
        for (int i = 2; i < 4; i++) {
            give_num_s[i] = '0' + give_num[i];
        }
        for (int i = 0; i < 4; i++) {
            cout << give_num_s[i] << " ";
        }
    }
}

void Input(char check_num[]) {
    if(frequency <=3){
        cout << "\n" << "\n" << "";
        cout << "\n" << "您的输入是：" << "";
        for (int i = 0; i < 4; i++) {
            cin >> check_num[i];
        }
        cout << endl;
        Compare(check_num,give_num_s);
    }
    else {
        Fobmit();
    }
}

void Compare(char check_num[], char give_num_s[]) {
    int x;
    for (int i = 0; i < 4; i++) {
        if (check_num[i] != give_num_s[i]) {
            cout <<"\n" << "您输入错了，请重新输入" << "\n";
            cout << "\n" << "您还有" << j << "次机会" << endl ;
            CleanScreen();
            return Input(check_num);
            Fobmit();    
        }
    }
    cout << "您输入正确" << "";
    return;
}

void Fobmit() {
    cout << "\n" << "";
    cout << "您的机会已经用尽！" << "";
    //CountDownTime();
}

void CleanScreen() {
    system("pause");
    system("cls");
    if (frequency <= 3) {
        Getnum();
        ++frequency;
        --j;
    }
    cout << "\n" << "";
}

Answer 1

在输入的同时实现倒计时功能必须使用多线程才能实现。