Reference
Harbison, Samuel P. and Steele, Guy L. C: A Reference Manual, Fourth Edition. Englewood Cliffs, NJ: Prentice Hall, 1994.
This reference manual presents the rules of the C language and describes most of the standard library functions. It points out differences between K&R C and ANSI C, and provides many examples.
Plauger, P.J. The Standard C Library. Englewood Cliffs, NJ: Prentice Hall, 1991.
This large reference manual describes the standard library functions, with more explanation than you would find in a typical compiler manual.
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