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cabsf, cabs, cabsl

From cppreference.com
< c‎ | numeric‎ | complex
Defined in header <complex.h>
float       cabsf( float complex z );
(1) (since C99)
double      cabs( double complex z );
(2) (since C99)
long double cabsl( long double complex z );
(3) (since C99)
Defined in header <tgmath.h>
#define fabs( z )
(4) (since C99)
1-3) Computes the complex absolute value (also known as norm, modulus, or magnitude) of z.
4) Type-generic macro: if z has type long double complex or long double imaginary, cabsl is called. If z has type float complex or float imaginary, cabsf is called. If z has type double complex or double imaginary, cabs is called. For real and integer types, the corresponding version of fabs is called.

Contents

[edit] Parameters

z - complex argument

[edit] Return value

If no errors occur, returns the absolute value (norm, magnitude) of z.

Errors and special cases are handled as if the function is implemented as hypot(creal(z), cimag(z))

[edit] Example

#include <stdio.h>
#include <complex.h>
 
int main(void)
{
    double complex z = 1.0 + 1.0*I;
    printf("%.1f%+.1fi cartesian is rho=%f theta=%f polar\n",
           creal(z), cimag(z), cabs(z), carg(z));
}

Output:

1.0+1.0i cartesian is rho=1.414214 theta=0.785398 polar

[edit] See also

(C99)(C99)(C99)
computes the phase angle of a complex number
(function) [edit]
computes absolute value of an integral value (|x|)
(function) [edit]
(C99)(C99)
computes absolute value of a floating-point value (|x|)
(function) [edit]
(C99)(C99)(C99)
computes square root of the sum of the squares of two given numbers (x2
+y2
)
(function) [edit]