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# log

From cppreference.com
< c‎ | numeric‎ | math

Defined in header `<math.h>` |  |
float logf( float arg ); |  | (since C99)
double log( double arg ); |  |
long double logl( long double arg ); |  | (since C99)

Computes the natural (base e) logarithm of `arg`.

### [edit] Parameters

arg | - | floating point value

### [edit] Return value

Natural logarithm of `arg`.

Domain error occurs if `arg` is negative. NAN is returned in that case.

Range error occurs if `arg` is ​0​. -HUGE_VAL is returned in that case.

### [edit] Example

| This section is incomplete Reason: no example

### [edit] See also

exp | returns e raised to the given power (ex) (function) [edit]
log10 | computes common (base 10) logarithm (log10(x)) (function) [edit]
pow | raises a number to the given power (xy) (function) [edit]
C++ documentation for log

Retrieved from "http://en.cppreference.com/mwiki/index.php?title=c/numeric/math/log&oldid=62592"
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- Todo no example