NAME

sqrt — square root function

SYNOPSIS

#include <math.h>

double sqrt(double x);

DESCRIPTION

The sqrt() function computes the square root of x ,

An application wishing to check for error situations should set errno to 0 before calling sqrt(). If errno is non-zero on return, or the return value is NaN, an error has occurred.

RETURN VALUE

Upon successful completion, sqrt() returns the square root of x.

If x is NaN, NaN is returned and errno may be set to [EDOM].

If x is negative, 0.0 or NaN is returned and errno is set to [EDOM].

ERRORS

The sqrt() function will fail if:

[EDOM]

The value of x is negative.

The sqrt() function may fail if:

[EDOM]

The value of x is NaN.

No other errors will occur.

EXAMPLES

None.

APPLICATION USAGE

None.

FUTURE DIRECTIONS

None.

SEE ALSO

isnan(3) , <math.h> , <stdio.h> .

DERIVATION

Derived from Issue 1 of the SVID.