What is cprojl in C?
Sheza MunirThe cprojl function is a variation of the cproj function, which computes the projection of a complex number on the
The l in cprojl indicates that this function’s argument and return datatype is a long double.
Syntax
long double complex cprojl(long double complex z);
Library
The cprojl function is accessible via the math.h library. To access complex numbers, we must include the complex.h header file.
Parameter
The cprojl function takes a single parameter: a complex number of datatype long double, the projection of which is also required.
Return value
The function returns the projection of the argument on the Reimann sphere as a complex number.
The
cprojlfunction maps all infinities (e.g. +3i, -7) to one infinity (i.e., ).
Code
The following code shows some examples of the use of cprojl function.
The cproj function returns a complex number, while the creal function returns the real part of the complex number and cimag returns the imaginary of the complex number.
#include <stdio.h>
#include <math.h>
#include <complex.h>
int main()
{
double complex num1 = cprojl(3 + 4*I);
printf("cproj(3 + 4i) = %.1f% + .1fi\n", creal(num1), cimag(num1));
// %.1f specifies precision of the given float number to 1 decimal place
double complex num2 = cprojl(INFINITY + 2.0*I);
printf("cproj(inf + 2i) = %.1f% + .1fi\n", creal(num2), cimag(num2));
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