By definition, pi is the ratio of the circumference of a circle to its diameter. Pi is always the same number, no matter which circle you use to compute it. For the sake of usefulness people often need to approximate pi.
Definition and Examples of Literary Terms. The term palindrome is derived from two Greek words âpalinâ means again and âdromosâ means way or direction. It is defined as a number, a word, a sentence, a symbol or even signs that can be read forward as well as backward or in reserve order with the same effects and meanings.
Obviously if aString is itself a palindrome then aString is the longest palindrome inside aString. You can tell it is working by the assertion statement. Do not think too much about the first line of executable code. It runs in exponential time to the size of the given text. 2  It runs by enumerating all the strings in the form a-z, creating two regexes for each generated string and testing the input against each regex. 3  Further, it fails if the palindrome contains uppercase letters, numbers, non-ascii text, punctuation, etc.