scanf（）无需暂停while循环

Question

我正在为计时器编写代码，到目前为止，如果我按1计时器开始运行，但是当我按2停止/暂停计时器时它不会停止，有人可以帮忙吗？

#include <stdio.h>#include <stdlib.h> 
#include <windows.h>
#define TRUE 1

int main(void) {
int hour = 0, min = 0, sec = 0;
int num1;
int num2;

printf("Press 1 to start the timer");
scanf_s("%d", &num1);

if (num1 == 1) {
    while (TRUE) {
        printf("\r %2d : %2d : %2d", hour, min, sec, "\n");
        printf("\t\t\t""Press 2 to stop the timer");

        sec++;
        Sleep(1000);
        if (sec == 59) {
            min++;
            sec = 0;
        }
        if (min == 59) {
            hour++;
            min = 0;
            sec = 0;
        }

        if (scanf_s("&s", &num2)) {
            (num2 == 2);
                break;
        }

    }
}

                return 0;
}