olivamadrigal / arithmetic_grammar_parser

Arithmetic Grammar Top-Down Parser

Arithmetic_Grammar_Parser

Arithmetic Grammar Top-Down Parser

See image for lab instructions (instructions.png)

1. $lex lexer.l

2. $gcc -o lexer lex.yy.c

3. $echo TEST_EXPRESSION | ./lexer

EXAMPLES: $ echo 1+1 | ./lexer

Syntax Error--Invalid Input String

$ echo 22 | ./lexer

Valid Arithmetic Expression String

$ echo "22" | ./lexer

Valid Arithmetic Expression String

$ echo "9+2" | ./lexer

Syntax Error--Invalid Input String

$ echo "9 + 2" | ./lexer

Valid Arithmetic Expression String