rules.txt

program -> variable_declarations functions-List
variable_declarations -> variable_declarations variable_declaration | 
variable_declaration -> type identifier ; | type identifier [ num ] ;
stmts -> stmts stmt | 
stmt -> assignment_stmt | return_stmt | ifelse_stmt | for_stmt | while_stmt | block_stmt | variable_declarations
while_stmt -> while ( expression ) { stmts } 
type -> int | double | char
boolean_expression -> true | false | expression relaional_op expression | boolean_expression logical_op boolean_expression
relational_op -> <= | >= | < | == | >
logical_op -> &&
expression -> expression + term  | expression - term | term
term -> term * factor | term / factor | factor
factor -> ( expression ) | id | num | double_val | id [ num ] | boolean_expression
block_stmt -> { stmts }
return_stmt -> return id ; | return num ; | return double_val ; | return ;
for_stmt -> for ( expression ; boolean_expression ; expression ) block_stmt
ifelse_stmt -> if ( boolean_expression ) { stmts } | if ( boolean_expression ) { stmts } else { stmts }
assignment_stmt -> id = expression ; | id [ num ] = expression ;
functions-List -> functions-List function | function
function -> void id ( paramList ) block_stmt | type id ( paramList ) block_stmt
paramList -> paramList , variable_declaration | variable_declaration |