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The new home for Visual Studio documentation is Visual Studio 2017 Documentation on docs.microsoft.com.
The latest version of this topic can be found at _cabs.
Calculates the absolute value of a complex number.
Syntax
double _cabs(
struct _complex z
);
Parameters
z
Complex number.
Return Value
_cabs
returns the absolute value of its argument if successful. On overflow, _cabs
returns HUGE_VAL
and sets errno
to ERANGE
. You can change error handling with _matherr.
Remarks
The _cabs
function calculates the absolute value of a complex number, which must be a structure of type _complex. The structure z
is composed of a real component x
and an imaginary component y
. A call to _cabs
produces a value equivalent to that of the expression sqrt
( z.x``*``z.x``+``z.y
*z.y
).
Requirements
Routine | Required header |
---|---|
_cabs |
<math.h> |
For more compatibility information, see Compatibility in the Introduction.
Example
// crt_cabs.c
/* Using _cabs, this program calculates
* the absolute value of a complex number.
*/
#include <math.h>
#include <stdio.h>
int main( void )
{
struct _complex number = { 3.0, 4.0 };
double d;
d = _cabs( number );
printf( "The absolute value of %f + %fi is %f\n",
number.x, number.y, d );
}
The absolute value of 3.000000 + 4.000000i is 5.000000
.NET Framework Equivalent
Not applicable. To call the standard C function, use PInvoke
. For more information, see Platform Invoke Examples.
See Also
Floating-Point Support
abs, labs, llabs, _abs64
fabs, fabsf, fabsl
labs, llabs