//目的是将数字换成字符串 如123换成"123"
wchar_t* NumTOChar(int n)
    {
        wchar_t k='a';
        int len=0,t=n;
        while(t=t/10)
        {
            len++;
        }
         wchar_t *str=new wchar_t [len];
        t=1;
        for(int i=len-1;i>0;i--)
        {
            t=10*t;
            str[i]=(wchar_t)(n%t+k);
        }
        return str;
    }

就算把len初始值为1也得不到答案啊