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| 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 |
|
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