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hat is a syntax tree? Draw the syntax tree for the assignmentstatement a := b * -c + b * -c.

Question

hat is a syntax tree? Draw the syntax tree for the assignmentstatement a := b * -c + b * -c.

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Solution

A syntax tree, also known as a parse tree or a concrete syntax tree, is a tree representation of the syntactic structure of a sentence or string according to some formal grammar. It is used in parsing sentences in natural languages as well as in computer languages.

The syntax tree for the assignment statement a := b * -c + b * -c would look like this:

     :=
    / \
   a   +
      / \
     *   *
    / \ / \
   b  - b  -
      |   |
      c   c

Here's how to read the tree:

  • The root of the tree is the assignment operator (:=), which takes two children: the variable a and the expression on the right.
  • The right child of the root is the addition operator (+), which takes two children: the two multiplication expressions.
  • Each multiplication operator (*) takes two children: the variable b and the negation of c.
  • The negation operator (-) takes one child: the variable c.

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What are the functions used to create the nodes of syntax tree?

Compare syntax tree and parse tree.

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