c++ - 计数器一直重复请提供答案

Question

现在，我正在学习 C 编程，我在“Codeproject.com”上偶然发现了一个倒计时代码，并决定运行它并分析它来学习。但是，输出倒计时会在移动到下一个之前重复每个数字数千次。请帮助我理解这是为什么。代码如下所示:

#include <stdio.h>
#include <time.h>

int main()
{
      unsigned int x_hours = 0;  
      unsigned int x_minutes = 0;
      unsigned int x_seconds = 0;
      unsigned int x_milliseconds = 0;
      unsigned int totaltime = 0, count_down_time_in_secs = 0, time_left=0;

      clock_t x_startTime, x_countTime;
      count_down_time_in_secs = 10; // 1 min is 60

      x_startTime = clock();
      time_left = count_down_time_in_secs-x_seconds;  //update timer

      while (time_left>0)
      {
        x_countTime = clock();
        x_milliseconds = x_countTime-x_startTime;
        x_seconds=(x_milliseconds/(CLOCKS_PER_SEC))-(x_hours*60);
        x_minutes=(x_milliseconds/(CLOCKS_PER_SEC))/60;
        x_hours=x_minutes/60;


        time_left = count_down_time_in_secs-x_seconds; 

        printf("\nyou have %d seconds left", time_left, count_down_time_in_secs);
      }

      printf("\n\n\nTime's out\n\n\n");

    return 0;
}

Answer 1

计算机速度很快，所以循环每秒会执行很多次。您需要存储以前的时间，将其与当前时间进行比较，只有在发生变化时才打印。

此外，您的 printf() 调用只有一个 %d 占位符，但您向它传递了两个参数。