randstr隨機字符串（VC++）

#include <iostream>
#include <ctime>
using namespace std;

string randstr(string strCharElem,int nOutStrLen)
{
	string strRet;
	strRet.insert(0,nOutStrLen,'\0');
	srand((unsigned)time(0));
	int iRand = 0;
	for (int i = 0; i < nOutStrLen; ++i)
	{
		iRand = rand() % strCharElem.length();
		strRet[i] = strCharElem[iRand];
	}
	return strRet;
}

int main()
{
	string str = randstr("abcdefghigklmnopqrstuvwxyz",5);
	cout << "randstr Result:" << endl << str.c_str() << endl;
	getchar();

	return 0;
}

運行結果：