Qt is a cross-platform application and UI framework for developers using C++ or QML, a CSS & JavaScript like language. Qt Creator is the supporting Qt IDE.
Qt now includes QtCreater and QtDesign.
DOWNLOAD & INSTALL
1.Go to the website: http://qt-project.org/downloads to download Qt5.2, i.e.Qt 5.2.1 for Linux 32-bit or Qt Online Installer for Linux 32-bit
As it says, this file includes QtCreater & QtLibrary.
I suppose your download location is ~/Downloads/qt-opensource-linux-x86-5.2.1.run
2.Change the permission of the qt file.
$chmod +x qt-opensource-linux-x86-5.2.1.run
3.Execute the qt file
$sudo ./qt-opensource-linux-x86-5.2.1.run
And it guides you finish the installation.
USAGE
You can input the command $/opt/Qt-5.2.1/Tools/QtCreater/bin/qtcreater & to start QtCreater or goto the applications list and click the QtCreater icon.