$1.$ General

This assignment involves writing a scanner for C$--.$ This scanner will then be used for the remaining

assignments in the semester project.

$2.$ Required functionality

$2\mathrm{.}1.$ Programming requirements

Your program should implement a function get$\_$token$()$ that behaves as follows:

$$ It reads input from stdin.

$$ It discards comments and whitespace $($however$,$ even though comments and whitespace are

discarded, they are significant in that they signal the end of any previous token$).$ The syntax for

comments is given in Section $1\mathrm{.}3$ of the G$0$ language spec.

$$ It identifies and returns tokens based on the tokens and patterns given in Section $1\mathrm{.}2$ of the G$0$

language spec.

Your program should use the following two files:

$$ scanner.h $--$ a header file that defines the set of tokens together with their values; and

$$ scanner$-$driver.c $--$ a file containing the driver code that invokes your scanner and prints out the

results.

In subsequent assignments we will replace the driver file scanner$-$driver.c with a different driver, so you may

not want to put your scanner implementation in this file.

You should submit a Makefile that provides $($at least$)$ the following targets:

$$ make clean:

Deletes any object files $(*.$o $)$ as well as the file 'scanner'

$$ make scanner:

Compiles all the files from scratch and creates an executable file named 'scanner'.