First and Follow in Compiler Design

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Questions and Answers

What is the purpose of First and Follow?

To calculate the average of a set of numbers
To determine the first and last elements in an array
To find the starting and ending positions of a string
To identify the first and follow sets of a non-terminal in a grammar (correct)

In the context of compiler design, what does the First set represent?

The final output of a program
The set of all possible strings in a language
The initial state of a parsing table
The set of terminals that start the strings derivable from a non-terminal (correct)

What is the Follow set used for in compiler design?

To identify the terminals that can appear immediately to the right of a non-terminal in a sentential form (correct)
To track variable declarations in a program
To store intermediate values during parsing
To determine the length of a string

First set is used to ______

predict the possible starting terminals of a production Signup and view all the answers

Follow set is used to ______

predict the possible terminals that can follow a non-terminal in a production Signup and view all the answers

First and Follow sets are used in compiler design to help with ______

constructing predictive parsing tables for LL(1) grammars Signup and view all the answers

Study Notes

First and Follow Sets in Compiler Design

The purpose of First and Follow sets is to help with parsing and syntax analysis in compiler design.

First Set

The First set represents the set of terminals that can begin a string derived from a given non-terminal.
It is used to determine the possible starting symbols of a production.

Follow Set

The Follow set is used to determine the possible next terminals that can come after a given non-terminal.
It is used to handle parsing and syntax analysis by predicting the next terminal symbol that can come after a non-terminal.

Usage of First and Follow Sets

First set is used to predict the possible starting symbols of a production.
Follow set is used to predict the possible next terminals that can come after a non-terminal.
First and Follow sets are used together to help with parsing and syntax analysis by resolving parsing conflicts and ambiguities.

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Test your knowledge of First and Follow sets in compiler design. Understand the purpose of First and Follow, and their significance in the context of compiler design.