When comparing The New Boston C Course vs Essential C, the Slant community recommends Essential C for most people. In the question“What are the best resources to learn C/C++?” Essential C is ranked 4th while The New Boston C Course is ranked 25th. The most important reason people chose Essential C is:
The book is available as a free pdf.
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Pros
Pro Video tutorials
Tutorials are presented as videos, making them easy to follow / see what's going on at each step. Many people find this format less daunting and easier to take in than traditional text based tutorials.
Pro Setup instructions included
The first video explains how to set up everything you need to get started on your machine. A lot of tutorials tell you about the language but leave you in the dark on how to get it up and running, creating a stumbling block before the first post.
Pro Suitable for beginners
No assumptions are made about prior knowledge, meaning anyone can start watching and pick up the basics of the language fairly quickly.
Pro Free
The book is available as a free pdf.