C++ libraries

C++ includes several different libraries. They provide a variety of different functions. So the programmer does not need to reinvent the wheel. The functions in a library are made available with the include directive:

#include <library_name>

For example,

iostream for I/O operations or
iomanip for manipulating the output

Let's take a closer look at a new one called cmath.
cmath contains predefined math related functions. The functions (listed in the table) can be used in a program by adding #include <cmath> at the beginning of the source code.

function	description
abs( x )	Absolute value of real value x
pow( x,y )	x raised to power y
sqrt( x )	Square root of x
ceil( x )	Least integer greater than or equal to x
floor( x )	Greatest integer less than or equal to x
exp( x )	Exponential function e^x
log( x )	Natural logarithm of x
log10( x )	Base 10 logarithm of x
sin( x )	Sine of x (in radians)
cos( x )	Cosine of x (in radians)
tan( x )	Tangent of x (in radians)
asin( x )	inverse sine of x
acos( x )	Inverse cosine of x
atan( x )	Inverse tangent of x
sinh( x )	Hyperbolic sine of x
cosh( x )	Hyperbolic cosine of x
tanh( x )	Hyperbolic tangent of x

Reference: C++ reference, cpp reference, wikipedia

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