Program 7: Cloning Myself
Make files #
In the current day of project builders, scaffolding, runners, and so forth one
may forget that there was a time, not so long ago, that you could just use a program
installed on almost every *nix operating system. That program is make.
The syntax for a make file is very simple.
target: prerequisites
<TAB>steps to build
The first part is defining which files you need for the program. For the basic single file that you have been using, you only need one fine: main.o. Then you need to tell make how to create the main.o file.
main: main.o
ld -o main main.o
main.o: main.s
as -o main.o main.s
Soon, however, you will be writing programs with more than one object file. In order to create a base make file that can easily be edited, you need to adapt it slightly.
# Define the object files you need for the final executable
OBJS = main.o
# The next line uses % which is a wildcard character to refer to all .s and .o files
%.o : %.s
# $< = source file, $@ = output file
as $< -o $@
# build the main executable
main: $(OBJS)
ld -o main $(OBJS)
Program 7: Cloning Myself Video
Description of Program
Having lived through quarantine, I have decided that I would like the last year or so of my life back. In order to do this, I am going to clone myself and then transfer my brain into a new body. However, since replication errors are a thing, write a program that will show the expected pairs so I can double check.
In DNA strings, symbols “A” and “T” are complements of each other, as “C” and “G”. The input is already entered for you in the template.