Leading and Trailing

What is the LEADING(S) for the following grammar?

S➔S-B|B

B➔B*A|A

A➔(S)|id

• LEADING(S)={-,*,),id}    

• LEADING(S)={-,*,(,id}    

• LEADING(S)={-,*,(,)}

• LEADING(S)={-,*,(}

What is the TRAILING(T) for the following grammar?

E➔E+T|T

T➔T*F|F

F➔id|(E)

• TRAILING(T)={+,*,(}        

• TRAILING(T)={*,id,(}

• TRAILING(T)={*,id,)}      

• TRAILING(T)={+,*,id}

If production is of form  A→ αa or A → αaB where B is Non-terminal, and α can be any string then it is applicable to

• Trailing

• Leading

• LR

• LALR

Leading and Trailing are two functions belongs to

• Predictive Parser

• Operator Precedence parser

• Syntax Analayzer

• Intermediate Code Generator

Which function is uesd to map terminal symbols to integers in Operator precedence parsers?

• precedence functions      

• operator function

• Lex Function

• Iterative Function