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## Example files for the title:  

# Managing Projects with GNU Make 3rd Edition, by Robert Mecklenburg

[![Managing Projects with GNU Make 3rd Edition, by Robert Mecklenburg](http://akamaicovers.oreilly.com/images/9780596006105/cat.gif)](https://www.safaribooksonline.com/library/view/title/0596006101//)

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# combine - concatentate one sequence of numbers with another

combine = $(foreach i, $1, $(addprefix $i, $2))

# stripzero - Remove one leading zero from each word

stripzero = $(patsubst 0%,%,$1)

# generate - Produce all permutations of three elements from the word list

generate = $(call stripzero,				\

             $(call stripzero,				\

               $(call combine, $1,			\

	         $(call combine, $1, $1))))

# number_line - Create a number line from 0 to 999

number_line := $(call generate,0 1 2 3 4 5 6 7 8 9)

length      := $(word $(words $(number_line)), $(number_line))

# plus - Use the number line to add two integers

plus = $(word $2,					\

         $(wordlist $1, $(length),			\

	   $(wordlist 3, $(length), $(number_line))))

# gt - Use the number line to determine if $1 is greater than $2

gt = $(filter $1,					\

       $(wordlist 3, $(length),				\

	 $(wordlist $2, $(length), $(number_line))))

all:

	@echo $(call plus,4,7)

	@echo $(if $(call gt,4,7),is,is not)

	@echo $(if $(call gt,7,4),is,is not)

	@echo $(if $(call gt,7,7),is,is not)

# backwards - a reverse number line

backwards := $(call generate, 9 8 7 6 5 4 3 2 1 0)

# reverse - reverse a list of words

reverse    = $(strip					 \

	       $(foreach f,                              \

                 $(wordlist 1, $(length), $(backwards)), \

                 $(word $f, $1)))

# minus - compute $1 minus $2

minus      = $(word $2,                                \

               $(call reverse,                         \

                 $(wordlist 1, $1, $(number_line))))

minus:

	# $(call minus, 7, 4)