COMPILER DESIGN

LEXICAL ANALYSIS

CONSTRUCTION OF A LEXICAL ANALYZER

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
The minimum number of states required in a DFA (along with a dumping state) to check whether the 3rd bit is 1 or not for |n|>=3, where n is number of bits.
A
3
B
4
C
5
D
1
Explanation: 

Detailed explanation-1: -The minimum number of states is 4.

Detailed explanation-2: -The finite automaton accepting nothing will contain transitions on all input symbols to itself only. Thus atleast 1 state is necessarily required.

Detailed explanation-3: -Explanation: The DFA can be minimized to two states and the second state is final state .

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