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As part of the first phase of your project you have to implement the syntax analyser for a subset of the decaf programming language. Your analyser should be able to handle simple expressions.
Here is the grammar subset you have to implement

⟨program⟩ → class Program ′{′ ⟨field_decl⟩∗ ⟨statement_decl⟩∗ ′}′

⟨field_decl⟩ → ⟨type⟩ {⟨id⟩ | ⟨id⟩ ′[′ ⟨int_literal⟩ ′]′ };

⟨statement_decl⟩ → ⟨location⟩ ⟨assign_op⟩ ⟨expr⟩ ;
| callout ( ⟨string_literal⟩ [, ⟨callout_arg⟩+,] ) ;

where all other (required) fields follow the rules as defined in the decaf manual.

Output (to stdout) “Success” on a successful parse, and “Syntax Error” in case of an error.
Output (to stderr) the name of the field reached followed by an endl.
For example, when processing ⟨statement_decl⟩ → ⟨location⟩ ⟨assign_op⟩ ⟨expr⟩ ;
write “statement_decl\n” to stderr.

code to write simple hello world . A flex, scanner generator example.