NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | ATTRIBUTES | STANDARDS | HISTORY | SEE ALSO | COLOPHON |
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sqrt(3) Library Functions Manual sqrt(3)
sqrt, sqrtf, sqrtl - square root function
Math library (libm, -lm)
#include <math.h> double sqrt(double x); float sqrtf(float x); long double sqrtl(long double x); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): sqrtf(), sqrtl(): _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L || /* Since glibc 2.19: */ _DEFAULT_SOURCE || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
These functions return the nonnegative square root of x.
On success, these functions return the square root of x. If x is a NaN, a NaN is returned. If x is +0 (-0), +0 (-0) is returned. If x is positive infinity, positive infinity is returned. If x is less than -0, a domain error occurs, and a NaN is returned.
See math_error(7) for information on how to determine whether an error has occurred when calling these functions. The following errors can occur: Domain error: x less than -0 errno is set to EDOM. An invalid floating-point exception (FE_INVALID) is raised.
For an explanation of the terms used in this section, see attributes(7). ┌─────────────────────────────────────┬───────────────┬─────────┐ │ Interface │ Attribute │ Value │ ├─────────────────────────────────────┼───────────────┼─────────┤ │ sqrt(), sqrtf(), sqrtl() │ Thread safety │ MT-Safe │ └─────────────────────────────────────┴───────────────┴─────────┘
C11, POSIX.1-2008.
C99, POSIX.1-2001. The variant returning double also conforms to SVr4, 4.3BSD, C89.
cbrt(3), csqrt(3), hypot(3)
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Linux man-pages 6.9.1 2024-05-02 sqrt(3)
Pages that refer to this page: cbrt(3), exp10(3), exp2(3), exp(3), hypot(3), log10(3), log2(3), log(3), pow(3)