How to make a quit button in unity Code Example - Coding

quit button unity

 void quitGame() {
     Application.Quit();
 }

how to make a quit button in unity

 //need to build to work
    public void quitGame() 
    {
        Application.Quit();
    }

exit button unity code

 void doExitGame() {
     Application.Quit();
 }

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