gettimeofday与随机数

#include
#include
#include
using namespace std;

 

int main()
{
        char *p[5];
        char s[64];
        int len = 5;
        int num = 0;

        struct timeval tv;
        struct timezone tz;

        for (int i = 0;i < len;++i)
        {
                p[i] = new char[64];

                stringstream ss;

                //取当前时间
                gettimeofday(&tv,&tz);
                cout << "秒：" << tv.tv_sec << ",微秒：" << tv.tv_usec << endl;

                srand(tv.tv_usec);
                num = rand();

                //类型转换
                ss << num;
                ss >> s;

                strcpy(p[i],s);
        }
        for (int i = 0;i < len;++i)
        {
                cout << "随机数" << i+1 << "：" << p[i] << endl;
                delete [] p[i];
        }

}