If you wanted to collect the number of comments users posted to a web page on your site, custom metric should be set up. C<span>ustom metrics are like default </span>metrics<span> in your Analytics account, except that you have to create them yourself. You can use them to collect and analyze data that Analytics doesn't automatically track.</span>
Entry control loop. Because a while loop can be infinite or not based on whether Boolean given is T or F. So we need to know the preexisting condition before we can solve it.
