fabs

template<class T>
    complex<T> fabs(complex<T>& x);

The fabs function computes the complex absolute value of x.

From z/OS® V1R13 XL C/C++, you can use C99 library facilities in your C++ code. This new TR1 template function fabs produces the same results as the existing C99 functions, as indicated in the following table.
TR1 template function Corresponding C99 function 
template <> complex<float> 
fabs(complex<float>& x);
 
float complex cabsf(float complex z);
 
template <> complex<double> 
fabs(complex<double>& x);
 
double complex cabs(double complex z);
 
template <> complex<long double> 
fabs(complex<long double>& x);
 
long double complex 
cabsl(long double complex z);
Note: To enable the TR1 headers, you must define the macro __IBMCPP_TR1__ as 1.