文本+变量在qDebug

Question

我想在qDebug中结合文本和变量:

QString city_name = "London";
qDebug() << QString("You choose CITY:").arg(city_name);

它不工作，我不知道为什么。错误:

QString::arg: Argument missing: You choose CITY:, ?????

Answer 1

添加%1:

QString city_name = "London";
qDebug() << QString("You choose CITY: %1").arg(city_name);