C++时钟不工作

我想做一个简单的程序，用户必须输入一个提示数字（1-4）。继续的条件是基于在用户选择的级别定义的时间内输入数字，当然，输入正确的数字。问题是程序会识别数字是否正确，但是您可以根据需要花费多长时间，并且不会停止游戏。这个"15分钟"的程序本应是一次对C++的深入研究，但它已经变成了一个周末的项目，令人困惑的时钟算法和混乱。以下是完整的源代码。任何帮助都会很棒...

编辑：这是在线C++模拟器的链接，因此您可以在当前状态下测试该程序...

#include <iostream>
#include <time.h>
#include <ctime>
#include <unistd.h>

using namespace std;
int main() {
    //input
    string numberGuessed;
    int intNumberGuessed;
    int score = 0;
    int actualNumber;
    int gameOver = 0;
    //Level Select Variables
    char level = {0};
    string input = " ";
    double timeForInput;

    //initialize random seed
    srand (time(NULL));

    //Generates random number
    actualNumber = rand() % 4 + 1;
    //LEVEL SELECTOUR
    cout << "Select A Level: 'e' 'm', or 'h':  ";
        getline(cin, input);
        if (input.length() == 1) {
            level = input[0];
        }
        if (level == 'e') {
            cout << "You Have Selected Easy..." << endl;
            cout<< "You Have .5 Second to Enter" << endl;
            timeForInput = 5;
        } else if(level == 'm'){
            cout << "You Have Selected Medium..." << endl;
            cout<< "You Have .2 Seconds to Enter" << endl;
            timeForInput = 2;
        } else if(level == 'h'){
            cout << "You Have Selected HARD!!!" << endl;
            cout<< "You ONLY Have .1 Seconds to Enter" << endl;
            timeForInput = 1;
        } else {
            cout << "You LOSE! GOOD DAY SIR!" << endl;
        }
        //Instructions and Countdown
        cout<<"Press The Number and Hit Enter in The Amount of Time Provided"<<endl;
        sleep(1);
        cout<<"3"<<endl;
        sleep(1);
        cout<<"2"<<endl;
        sleep(1);
        cout<<"1"<<endl;
        sleep(1);
        cout<<"GO!"<<endl;
        cout<<"--------------------------------------------------------------------------------"<<endl;
        cout<< "Enter the Numbers As They Appear:"<<endl;
        cout<<endl;
        cout<<endl;
        cout<<endl;
        sleep(1);
        double duration = 0.0;


        do {
        //Procedere For Each Round
        clock_t start;
        clock_t finish;

        start = clock();
        finish = clock();
        double delay = (double)(finish-start);

        //Clock
            start = clock();
            cout<<"The number is:  "<< actualNumber<<endl;
            getline(cin, numberGuessed);
            intNumberGuessed = stoi(numberGuessed);
            finish = clock();
            double elapsed = (double)(finish-start);
            elapsed-=delay;
            duration = elapsed/CLOCKS_PER_SEC;
            cout<<duration<<endl;
            //Test User's input
            if((intNumberGuessed == actualNumber) && (duration <= (timeForInput/10))){
                score += 1;
                gameOver = 0;
            } else if ((intNumberGuessed != actualNumber) || (duration >= (timeForInput/10))) {
                gameOver = 1;
            }
            //Reset Number
           actualNumber = rand() % 4 + 1;
        } while (gameOver != 1);

        cout<<"You Failed!"<<endl;
        sleep(1);
        cout<<"Your Score Was:  "<<score<<endl;
        return 0;
}