Calculates the absolute value of a complex number.
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.