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Repdigit/Palindrome Checker

Tag: register


A palindrome is a word, phrase, number, or other sequence of characters which reads the same backward or forward.

A repdigit is a natural number composed of repeated instances of the same digit in a positional number system (often implicitly decimal).

The palindrome/repnumber checker depicted in Figure 1 can perform two kinds of tests. One can test whether two, three, or four numbers entered are a palindrome or a repdigit. In our case, a palindrome is a sequence of numbers that remains the same when its numbers are reversed. For example, for the inputs IPalindrome3(12, 4, 12) and IPalindrome4(1, 3, 3, 1) output OYes will be returned. A repdigit is composed of repeated instances of the same number. For example, the inputs IRepnumber2(20, 20), IRepnumber3(7, 7, 7), or IRepnumber4(5, 5, 5, 5) lead to an OYes output.


SUT model
Fig. 1: SUT model  


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