将字符串“000000000000029120”前面的0去掉,用递归方法
removefirst0(QString s)
{
if(!s.left(1).operator ==("0"))
return s;
else
return removefirst0(s.right(s.length()-1));
}
输出结果:29120;
对29120进行+1后格式化输出结果
qint64 id_num;//longlong
QString s=removefirst0(id_num);
id_num=s.toInt();
id_num=++id_num;
QString str=QString("%1").arg(id_num2,18,10, QChar('0'));