Books like The C Answer Book
Clovis L. Tondo, Scott E. Gimpel
The C Answer Book is 217 pages, about 3 hours 59 minutes at 250 words a minute.
6 books to read next
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C++ Primer 11.3 h 
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Parallel Programming in C with MPI and OpenMP 9.7 h 
Learn C the Hard Way 7.0 h Solutions Manual for Fundamentals of Data Structures in C++ 4.2 h Bar height shows length. Estimated at 250 words a minute.