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One's Complement, Two's Complement


https://www.youtube.com/watch?v=Z3mswCN2FJs

"Two's complement successfully solves the problem of storing and manipulating negative numbers,
but recognize that, by sacrificing the first bit for flagging the sign, we are change the range of numbers we can represent. Four bits can represent the numbers 0 through 15 without a signed bit, and -8 through positive 7 with a sign bit. "

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Deploy Project to AWS EC2

Step 1 : build Amazon EC2 instance  Download the .pem file Select the instance you like to connect  Referance : http://dez.logdown.com/posts/2017/04/07/aws-ec2-deploy-nodejs-web-app Step 2 : connect to AWS EC2 Create a directory by Terminal: # mkdir -p ~/.ssh Move the download .pem file to the .ssh directory we just created:  # mv ~ /Downloads/[key name].pem ~/ssh change the permissions of the .pem file so only the root user can read it: #chmod 400 ~/.ssh/[key name].pem create a config file: # vim ~/.ssh/config Enter the following text into that config file Host *amazonaws.com IdentityFile ~/.ssh/[key name].pem User  ec2-user  Use the ssh command with your public DNS hostname to connect to your instance # ssh [public DNS] Referance : https://docs.aws.amazon.com/en_us/AWSEC2/latest/UserGuide/AccessingInstancesLinux.html
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