FAQ: Loops - Do...While Loop

Frequently Asked Questions C# FAQ
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This community-built FAQ covers the “Do…While Loop” exercise from the lesson “Loops”.

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This exercise can be found in the following Codecademy content:

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FAQs on the exercise Do…While Loop

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2

hi helppppppppppppppppppppp.

1 Like
3

Does anybody know the use of the ! in front of the while (!condition)? why is there? what does it do? when i ran the loop without it it broke everything

4

The “!” operator just means the opposite. For example, if we have a program like that

// this is assign to true
bool buttonClick = true;

  do {

     Console.WriteLine("BLARRRRRRRRR");

  }
  // this condition is false because the opposite of true is false which means our condition is met and the program will stop and print BLARRRRRRRRR to console
  while(!buttonClick);

this while(!buttonClick); means when the condition becomes false it will print BLARRRRRRRRR to console. And if not it will continue running until this condition met false.

5

The language in the exercises instruction is not as clear as it can be:

“If you don’t click the button to turn it off, the alarm will repeat until it is turned off.” Is a difficult sentence to wrap my head around even as a native english speaker.

Some alternatives:

The alarm will repeat until the button is turned off.
The alarm will repeat until the buttonClick is set to false.
While the button is clicked, the alarm will repeat.