how to deal with ＆quot;no such file error or diretory＆quot; error for a new programmer in QT creator

大家好，又见面了，我是全栈君。

when i try to develop a hello demo in QT creator with the code following :

#include<QApplication> #include<QLabel> int main(int argc,char *argv[]) { QApplication app(argc,argv); QLabel l(“hello,word!”); l.show(); return app.exec(); }

the IDE inform me that “QApplication no such file or directory”, then i search the Internet, and find that i should add the following code in “*.pro”:

QT += core gui widgets

or add the following:

QT += core gui greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

these code tell the qmake to include the header.

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