Problems on Finite Automata Last Updated : 30 Jan, 2025 Comments Improve Suggest changes Like Article Like Report Finite Automata (FA) are simple machines that help us understand how computers recognize patterns in data. They follow a set of fixed rules and read input step by step to determine if it follows a specific pattern. These machines are commonly used in spell-checkers, search engines, and text-processing programs.This page offers a collection of simple examples demonstrating how Finite Automata process different inputs:DFA for Strings not ending with “THE”DFA of a string with at least two 0’s and at least two 1’sDFA for accepting the language L = { anbm | n+m=even }DFA machines accepting odd number of 0’s or/and even number of 1’sDFA of a string in which 2nd symbol from RHS is ‘a’Practice problems on finite automataPractice problems on finite automata | Set 2To test your knowledge, attempt Quiz on Regular Languages and Finite Automata Comment More infoAdvertise with us Next Article Problems on Finite Automata A anushkadaym Follow Improve Article Tags : Theory of Computation Similar Reads Practice problems on finite automata Que-1: Draw a deterministic and non-deterministic finite automate which accept 00 and 11 at the end of a string containing 0, 1 in it, e.g., 01010100 but not 000111010. Explanation - Design a DFA and NFA of a same string if input value reaches the final state then it is acceptable otherwise it is no 2 min read Practice problems on finite automata | Set 2 A DFA is represented as {Q, Σ, q, F, δ}. In DFA, for each input symbol, the machine transitions to one and only one state. DFA does not allow any null transitions, meaning every state must have a transition defined for every input symbol. NFA is similar to DFA but includes the following features:It 3 min read Introduction of Finite Automata Finite automata are abstract machines used to recognize patterns in input sequences, forming the basis for understanding regular languages in computer science. They consist of states, transitions, and input symbols, processing each symbol step-by-step. If the machine ends in an accepting state after 4 min read Finite Automata with Output (Set 6) Prerequisite: Mealy and Moore Machines, Difference between Mealy machine and Moore machine In this article, we will see some designing of Finite Automata with Output, i.e., Moore and Mealy machines. Problem: Construction of the machines that take set of all string over {0, 1} as input and produce 'A 2 min read Finite Automata with Output (Set 3) Prerequisite: Mealy and Moore Machines, Difference between Mealy machine and Moore machine In this article, we will see some designing of Finite Automata with Output i.e, Moore and Mealy machines. Problem: Construction of the machines that take set of all string over {a, b} as input and count number 2 min read Finite Automata with Output (Set 5) Prerequisite: Mealy and Moore Machines, Difference between Mealy machine and Moore machine In this article, we will see some designing of Finite Automata with Output i.e, Moore and Mealy machines. Problem: Construction of the machines that take set of all string over {0, 1} as input and produce 'A' 2 min read Program for Deterministic Finite Automata (Set 2) In this article, we will learn about designing of Deterministic Finite Automata (DFA) and it's code implementation. Problem-1:Construction of a DFA for the set of string over {a, b} such that length of the string |w| is divisible by 2 i.e, |w| mod 2 = 0. Explanation - The desired language will be li 7 min read Reversing Deterministic Finite Automata Prerequisite – Designing finite automata Reversal: We define the reversed language L^R \text{ of } L  to be the language L^R = \{ w^R \mid w \in L \} , where w^R := a_n a_{n-1} \dots a_1 a_0 \text{ for } w = a_0 a_1 \dots a_{n-1} a_n Steps to Reversal: Draw the states as it is.Add a new single accep 4 min read Transition Table in Automata Transition Table :Transition function(∂) is a function which maps Q * ∑ into Q . Here 'Q' is set of states and '∑' is input of alphabets. To show this transition function we use table called transition table. The table takes two values a state and a symbol and returns next state. A transition table 4 min read Introduction of Pushdown Automata We have already discussed finite automata. But finite automata can be used to accept only regular languages. Pushdown Automata is a finite automata with extra memory called stack which helps Pushdown automata to recognize Context Free Languages. This article describes pushdown automata in detail.Pus 5 min read Like