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cabsf, cabs, cabsl

From cppreference.com
< c‎ | numeric‎ | complex
 
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Complex number arithmetic
Types and the imaginary constant
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Manipulation
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cabs
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Power and exponential functions
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Hyperbolic functions
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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