upgrading oracle 11 to oracle 18

Is there a way to upgrade Oracle11 database to Oracle 18XE without uninstalling Oracle 11 ? I searched from Oracle forums and website but I could not find any Readme file which tells how to upgrade it ?

I will be grateful if you can help me

Cheers

Copyright Notice：Content Author:「Tonyukuk」，Reproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article：https://stackoverflow.com/questions/54939722/upgrading-oracle-11-to-oracle-18

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