---
title: 四舍五入
updated: 2022-01-11 01:26:58Z
created: 2022-01-11 01:26:57Z
---

四舍五入
```c
#define do_div(n, base) ({                                             \
        uint64_t __base = (base);                                   \
        uint64_t __rem;                                             \
        __rem = ((uint64_t)(n)) % __base;                     \
        (n) = ((uint64_t)(n)) / __base;                       \
         __rem;                                                          \
  })
```