【Linux系统】第六节—简易倒计时+进度条（详解）

【本节课知识点画板】前奏知识点1、回车和换行回⻋概念换⾏概念⽼式打字机的例⼦\r&&\n

什么现象？

#include int main(){    printf("hello bite!\n");    sleep(3);    return 0;}

什么现象？？

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#include int main(){    printf("hello bite!");    sleep(3);    return 0;}

什么现象？？？

#include int main(){    printf("hello bite!");    fflush(stdout);    sleep(3);    return 0;}

#include#includeint main(){    int cnt = 10;    while(cnt >= 0)    {        printf("%-2d\r",cnt);        fflush(stdout);        sleep(1);        cnt--;    }    printf("\n");    return 0;}

#pragma once#includevoid FlushProcess(); 

define SIZE 101  #define STYLE '#'    //v2:根据进度，动态刷新进度条  void FlushProcess(double total,double current)  {      const char* lable = "|/-\\";      int len = strlen(lable);      static index = 0;      char buffer[SIZE];      memset(buffer,0,sizeof(buffer));        double rate = current*100/total;      int num = (int)rate;        int i = 0;      for(;i < num;i++)      {          buffer[i] = STYLE;      }      printf("[%-100s][%.1lf%%][%c]\r",buffer,rate,lable[index++]);      fflush(stdout);      index %= len;        if(num >= 100)      {          printf("\n");      }    }//v1:展示进度条的基本功能  void process()  {      int rate = 0;      char buffer[SIZE];      memset(buffer,0 , sizeof(buffer));      const char* lable="|/-\\";      int len = strlen(lable);        while(rate <= 100)      {          printf("[%-100s][%d%%][%c]\r",buffer,rate,lable[rate%len]);          fflush(stdout);          buffer[rate] = STYLE;           rate++;          usleep(50000);      }        printf("\n");  }

#include"process.h"  #include  #include        double total = 1024.0;      double speed[] = {1.0,0.5,0.2,0.1,0.01,0.02};            void download()      {          double current = 0.0;          srand(time(NULL));                while(current <= total)          {             FlushProcess(total,current);                    if(current == total)                  break;                    //下载代码              int random = rand()%6;              usleep(5000);              current += speed[random];              if(current >= total)              {                  current = total;               }                      }            }                                                                                                                                                                                      int main()      {          download();                return 0;    }