prodution

Question

Which of the following is not a production of the grammar, which generated the expression 19-25+70?

• A. E $\rightarrow$ E+T
• B. E $\rightarrow$ ET $\mid$ T
• C. T $\rightarrow$ 0 $\mid$ 1 $\mid$ 2 $\mid$ 3 $\mid$ 4 $\mid$ 5 $\mid$ 6 $\mid$ 7 $\mid$ 8 $\mid$ 9 $\mid$
• D. E $\rightarrow$ E - E

Answer 1

E -> E+T cannot generate right grammer

It should be replaced by E -> E+E

otherwise right grammar generation not possible .like this

Comments

little correction need in parse tree.

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Great srestha .

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tnks @Manoj

@Praveen Sir done ok?

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tree while using E->ET

Answer 2

Every one is necessary. 

1) It will generate the Numbers.

2) Will be used for + sign, But due to this it can not generate 10+25. It has to change E-> E + E

3) It is necessary for creating 2 digit number. 

4) will be used for - sign 

Hence Answer is 2. 

Comments

Ans given is 2 .which is not possible rt?

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@ManojK Can you think of not using that production and getting the desired expression?

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Nopes i am not thinking .Your ans is perfect.I am just telling the ans given of UPPCL org .

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@Arjun sir, please verify this.