//C++ 随机字符串生成函数
#include<iostream>
#include<ctime>
using namespace std;

const int LEN_NAME=4;

char *rand_str(char *str,const int len)
{
int i;
for(i=0;i<len;++i)
str[i]='A'+rand()%26;
str[++i]='\0';
return str;
}

void main()
{
srand(time(NULL));
int i;
char name[LEN_NAME+1];

for(i=0;i<20;++i)
{
cout<<rand_str(name,LEN_NAME)<<endl;
}
}