#
# This Makefile illustrates common rule formatting and some common shortcuts.
#

#
# Definitions at the top of a Makefile are used to give shorter names to
# longer UNIX commands, or parts of UNIX commands.  The two definitions in this
# Makefile name the compiler arguments we use, and the particular C compiler we
# use.  The names "CFLAGS" and "CC" could be any names we want; these
# particular names are standard practice in UNIX Makefiles.
#
CFLAGS = -ansi -pedantic -Wall -Werror -lm
CC = gcc $(CFLAGS)

#
# The rule named "all" compiles all eight example stats programs.  It does this
# by depending on the eight separate rules defined below.
#
# Note the backslash at the end of the first and second lines of the rule.
# This is just a line-continuation character, that effectively makes the rule
# one line long.  The syntax of a Makefile requires that the first line of a
# rule have the rule name and all of its dependencies.  Therefore, if it's
# longer than 80 characters, it's common practice to break it up using
# backslash line continuation characters.  This is simply a formatting nicety;
# lines longer than 80 characters are entirely acceptable in a Makefile.
#
all:	stats-wrong stats-no-functions stats-with-functions \
	stats-further-refined stats-non-neg stats-neg-drop stats-neg-error \
	stats-neg-error-return

#
# The stats-wrong rule depends on the C program stats-wrong.c.  It compiles
# this program using the CC shortcut defined at the top of the Makefile.  To
# use a shortcut, wrap its name in $(...).  For this rule, the shortcut '$(CC)'
# is equivalent to 'gcc -ansi -pedantic -Wall -Werror'.
# 
stats-wrong:		stats-wrong.c
			$(CC) stats-wrong.c -o stats-wrong

#
# The seven other rules have the same format at stats-no-functions.
#

stats-no-functions:	stats-no-functions.c
			$(CC) stats-no-functions.c -o stats-no-functions

stats-with-functions:	stats-with-functions.c
			$(CC) stats-with-functions.c -o stats-with-functions

stats-further-refined:	stats-further-refined.c
			$(CC) stats-further-refined.c -o stats-further-refined

stats-non-neg:		stats-non-neg.c
			$(CC) stats-non-neg.c -o stats-non-neg

stats-neg-drop:		stats-neg-drop.c
			$(CC) stats-neg-drop.c -o stats-neg-drop

stats-neg-error:	stats-neg-error.c
			$(CC) stats-neg-error.c -o stats-neg-error

stats-neg-error-return:	stats-neg-error-return.c
			$(CC) stats-neg-error-return.c -o stats-neg-error-return

#
# A rule named "clean" is commonly used in Makefiles.  It has no dependencies.
# It unconditionally runs the UNIX rm command to remove all of the compiled
# programs, so we can re-compile them all fresh.  To run this rule from the
# UNIX command line, type the command make clean.
# 
# Note that this rule is longer than 80 characters on one line, just to
# illustrate it's OK to do this.  I.e., it doesn't have backslash line
# continuations, like the all rule above.
#
clean:
	rm -f stats-wrong stats-no-functions stats-with-functions stats-further-refined stats-non-neg stats-neg-drop stats-neg-error stats-neg-error-return