SIMPLE SOLUTIONS

# SQRT(3) - man page online | library functions

Square root function.

Chapter
2015-04-19
```SQRT(3)                             Linux Programmer's Manual                             SQRT(3)

NAME
sqrt, sqrtf, sqrtl - square root function

SYNOPSIS
#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():
_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE ||
_POSIX_C_SOURCE >= 200112L;
or cc -std=c99

DESCRIPTION
These functions return the nonnegative square root of x.

RETURN VALUE
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.

ERRORS
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.

ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7).

┌─────────────────────────┬───────────────┬─────────┐
│Interface                │ Attribute     │ Value   │
├─────────────────────────┼───────────────┼─────────┤
│sqrt(), sqrtf(), sqrtl() │ Thread safety │ MT-Safe │
└─────────────────────────┴───────────────┴─────────┘
CONFORMING TO
C99, POSIX.1-2001, POSIX.1-2008.

The variant returning double also conforms to SVr4, 4.3BSD, C89.