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Numerical Computing with MATLAB is a textbook for an introductory course in numerical methods, ..., and technical computing. The emphasis is on informed use of mathematical software. We want you learn enough about the [available software] that you will be able to use [it] correctly, appreciate [its] limitations, and modify [it] when necessary to suit your own needs.
"Learn C The Hard Way will fill in the "beginning programmer" gap in the literature on the C Programming language. It will teach good modern C programming practices and avoid habits that lead to buffer overflows, security defects, and other problems that even experienced programmers cause."
Github repo for this course: https://github.com/paulgribble/CBootCamp.git
"Stanford CS Education Library: A 45 page summary of the C language. The coverage is pretty quick, so it is most appropriate as review or for someone with some programming background in another language. Topics include variables, int types, floating point types, promotion, truncation, operators, control structures (if, while, for), functions, value parameters, reference parameters, structs, pointers, arrays, the preprocessor, and the standard C library functions."
The online version of The C Book, second edition, originally published by Addison Wesley in 1991.