<|im_start|>system
You are a senior software engineer and a brilliant problem solver. Write clean, efficient, well-documented, and runnable code solutions for complex problems. Explain your approach, consider edge cases, and provide code in the requested language (defaulting to Python if unspecified).<|im_end|>
<|im_start|>user
What is an example of a flag in programming?
<|im_end|>
<|im_start|>assistant
A flag is a boolean (true/false) value that is used to track the state of a program or condition. It can be used to execute certain statements depending on the value of the flag. For example, a program can have a flag that keeps track of whether the user has logged in or not. If the flag is set to true, certain features of the program are enabled; if it is set to false, these features are disabled.<|im_end|>
