【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 &&
2、⾏缓冲区
什么现象？
代码语言：JavaScript代码运行次数：0运行复制
#include <stdio.h>int main(){ printf("hello bite! "); sleep(3); return 0;}
什么现象？？
代码语言：javascript代码运行次数：0运行复制
#include <stdio.h>int main(){ printf("hello bite!"); sleep(3); return 0;}
什么现象？？？
代码语言：javascript代码运行次数：0运行复制
#include <stdio.h>int main(){ printf("hello bite!"); fflush(stdout); sleep(3); return 0;}
五、练手—倒计时小程序代码语言：javascript代码运行次数：0运行复制
#include<stdio.h>#include<unistd.h>int main(){ int cnt = 10; while(cnt >= 0) { printf("%-2d ",cnt); fflush(stdout); sleep(1); cnt--; } printf(" "); return 0;}
六、进度条process.h代码语言：javascript代码运行次数：0运行复制
#pragma once#include<stdio.h>void FlushProcess();
process.c代码语言：javascript代码运行次数：0运行复制
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] ",buffer,rate,lable[index++]); fflush(stdout); index %= len; if(num >= 100) { printf(" "); } }//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] ",buffer,rate,lable[rate%len]); fflush(stdout); buffer[rate] = STYLE; rate++; usleep(50000); } printf(" "); }
main.c代码语言：javascript代码运行次数：0运行复制
#include"process.h" #include<stdlib.h> #include<time.h> 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; }
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