#include<math.h>头文件藏的函数

1.floor作用：一般用于处理精度问题

 floor是向下取整，比如4.5取4

double right=4.5234;
printf("%.2lf\n",floor(right*100)/100); //答案是4.52

double right=4.53;
printf("%.2lf\n",floor(right)); //答案是4

double right=4.52;
printf("%.2lf\n",floor(right)/100); //答案是0.04

原文地址：https://www.cnblogs.com/Aiahtwo/p/9903230.html