Chapter Contents |
Previous |
Next |
sqrt |
Portability: | ISO/ANSI C conforming, UNIX compatible |
SYNOPSIS | |
DESCRIPTION | |
RETURN VALUE | |
DIAGNOSTICS | |
EXAMPLE | |
RELATED FUNCTIONS | |
SEE ALSO |
SYNOPSIS |
#include <math.h> double sqrt(double x);
DESCRIPTION |
sqrt
computes the square root of its argument
x
.
RETURN VALUE |
sqrt
returns the positive square root of
x
,
expressed as a double-precision, floating-point number.
DIAGNOSTICS |
For a negative value of
x
, the function returns 0.0, and the run-time library writes an error
message to
stderr
(the standard error file).
If an error occurs in
sqrt
, the
_matherr
routine is called.
You can supply your own version of
_matherr
to suppress the diagnostic message or modify the value returned.
EXAMPLE |
#include <math.h> #include <stdio.h> main() { double x; puts("Enter the number you want the square root of: "); scanf("%lf", &x); printf("The square root of %f is %f\n", x, sqrt(x)); }
RELATED FUNCTIONS |
SEE ALSO |
Chapter Contents |
Previous |
Next |
Top of Page |
Copyright © 2001 by SAS Institute Inc., Cary, NC, USA. All rights reserved.