August 2021
Intermediate to advanced
450 pages
6h 57m
Chinese
Content preview from C++程序设计语言（第4部分：标准库）（原书第4版）
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43.6 日期和时间
在<ctime>中，可以找到一些日期和时间相关的类型和函数：
struct tm定义如下：
函数clock（）提供了对系统时钟的支持，其返回类型clock_t的含义可由其他几个函数解释：
下面是asctime（）返回结果的例子：
下面是一个用clock（）进行函数计时的例子：
在除法运算之前进行显式类型转换double（t2-t1）是必要的，因为clock_t可能是整数。对clock（）的返回值t1和t2而言，double（t2-t1）/CLOCKS_PER_SEC是系统对两次调用间隔秒数的最佳近似。 ...
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