struct timeval tx;gettimeofday(&tx,NULL);srand(tx);int flag =rand() % 3;
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&tx,NULL);
This code snippet uses the gettimeofday() function from the <sys/time.h> header file to obtain the current time and store it in the timeval structure variable named tx.
The gettimeofday() function is used for measuring time intervals with high precision. It returns the current time as the number of seconds and microseconds since the Epoch (January 1st, 1970 at 00:00:00 UTC).
The NULL argument in the function call indicates that the timezone information is not required and can be ignored.
相关问题
`gettimeofday` 是一个在类 Unix 系统中（如 Linux）使用的函数，它用于获取当前的时间。该函数被定义在 `<sys/time.h>` 头文件中。函数原型如下：
int gettimeofday(struct timeval *tv, struct timezone *tz);
```
`gettimeofday()` 是一个标准 C/C++ 函数，它