matlab question

It is possible to have a loop that terminates when a special value of a particular variable occurs. The special value itself is often called a sentinel value, a trip value, or a rogue value. A loop that features a sentinel value is called a sentinel loop. Prompt the user to enter a number. Continue prompting the user until the user enters infinity (i.e. inf). Then, calculate the median of all of the numbers the user entered. Be sure you do not include the sentinel value in your calculation of the median