C 随机数产生

// ConsoleApplication5.cpp : Defines the entry point for the console application.
//
 
#include "stdafx.h"
#include <algorithm>
#include <vector>
#include <time.h>
using namespace std;
 
int _tmain(int argc, _TCHAR* argv[])
{
    srand(unsigned(time(NULL)));//一定要这条，不然后面的结果每次运行都一样
 
    std::vector<char> vv;
    vv.push_back('');
    vv.push_back('');
    vv.push_back('');
    vv.push_back('');
    vv.push_back('');
    vv.push_back('');
 
    printf("before random_shuffle:\n");
    for(unsigned int i = ; i < vv.size(); i++)
    {
        printf("vv is %c\n",vv.at(i));
    }
 
    random_shuffle(vv.begin(),vv.end()); //需包含头文件#include <algorithm>
    printf("after random_shuffle:\n");
    for(unsigned int i = ; i < vv.size(); i++)
    {
        printf("vv is %c\n",vv.at(i));
    }
 
    return ;
}