how to make a button to quit the application in unity code example

Example 1: quit button unity

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

Example 2: exit game unity

//Quit/Stop Game
Application.Quit();

Example 3: exit button unity code

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

Example 4: exit button unity code

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