cbrt, cbrtf, cbrtl
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                    | Defined in header  <math.h> | ||
| float       cbrtf( float arg ); | (1) | (since C99) | 
| double      cbrt( double arg ); | (2) | (since C99) | 
| long double cbrtl( long double arg ); | (3) | (since C99) | 
| Defined in header  <tgmath.h> | ||
| #define cbrt( arg ) | (4) | (since C99) | 
1-3) Computes the cubic root of 
arg.4) Type-generic macro: If 
arg has type long double, cbrtl is called. Otherwise, if arg has integer type or the type double, cbrt is called. Otherwise, cbrtf is called.| Contents | 
[edit] Parameters
| arg | - | floating point value | 
[edit] Return value
If no errors occur, the cubic root of arg (3√arg), is returned.
If a range error occurs due to underflow, the correct result (after rounding) is returned.
[edit] Error handling
Errors are reported as specified in math_errhandling.
If the implementation supports IEEE floating-point arithmetic (IEC 60559),
- if the argument is ±0 or ±∞, it is returned, unchanged
- if the argument is NaN, NaN is returned.
[edit] Notes
cbrt(arg) is not equivalent to pow(arg, 1.0/3) because pow cannot raise a negative base to a fractional exponent.
[edit] Example
Run this code
Output:
cbrt(729) = 9.000000 cbrt(-0.125) = -0.500000 cbrt(-0) = -0.000000 cbrt(+inf) = inf
[edit] References
- C11 standard (ISO/IEC 9899:2011):
- 7.12.7.1 The cbrt functions (p: 247)
 
- 7.25 Type-generic math <tgmath.h> (p: 373-375)
 
- F.10.4.1 The cbrt functions (p: 524)
 
- C99 standard (ISO/IEC 9899:1999):
- 7.12.7.1 The cbrt functions (p: 228)
 
- 7.22 Type-generic math <tgmath.h> (p: 335-337)
 
- F.9.4.1 The cbrt functions (p: 460)
 
[edit] See also
| (C99)(C99) | computes a number raised to the given power (xy) (function) | 
| (C99)(C99) | computes square root (√x) (function) | 
| (C99)(C99)(C99) | computes square root of the sum of the squares of two given numbers (√x2 +y2 ) (function) | 
| C++ documentation for cbrt | |


