c++ - Qt 5 build error: extra characters after test expression -

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I'm trying to learn QT 5.3, and this is my first program (Hello World).

I do not understand why this error occurs. I have taken some simple code from the Internet to check whether I have installed QT correctly or not. Here's the code: 

  #include & lt; QApplication & gt; # Include & lt; QPushButton & gt; Int main (int argc, char ** argv) {QApplication app (argc, argv); QPushButton Button ("Hello World!"); Button.show (); Return app.exec (); }

The error is displayed in row 3, 5, 6, 8. I'm totally new to Qt, so please give a simple explanation.

Check the .pro file. Sometimes this happens because you do not have a blackslash at the end of a line that is not the last: 

  HEADERS + = Qt / mainwindow.h \ Qt / MPrintableWidget.h \ Qt / Ampantable WidgetGram.H #OUoff \ "QT / MFICXDialog H \ QT / MSCPPH H \ / Code>

Exclude every line given below, and need to end in a backslash.

< / Div>

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