一、数学计算

#include <math.h>

1、上取整 double ceil(double)

int num;int batchsize = 1000;int batchnum = static_cast
     
      (ceil((double)num/batchsize));
     

 2、下取整 double floor(double)

 

二、计时

#include <windows.h>

clock_t start,end;start = clock();....end = clock();double miaoshu = (double)(end-start) / CLOCKS_PER_SEC;

 

三、