Assigning to the real or imaginary part of a complex number in C

I need to work on complex to extract imaginary roots of polynomial using Newton's method.

I'm getting an error, so I broke the code down to simple problem to see what's wrong. When I try to compile it it returns an error:

warning: target of assignment not really an lvalue; this will be a hard error in the future

Also I would like to know if there is anyway I can display the whole complex number without going with creal and cimag .

#include<stdio.h>
#include<complex.h>

int main()
{
  double complex z1 = 2 + 3*I;
  creal(z1) = 5;
  cimag(z1) = 10;
  printf("%.2f +%.2f *i n", creal(z1), cimag(z1));
  return 0;
}

---

The problem is these lines:

creal(z1) = 5;
cimag(z1) = 10;

creal and cimag return doubles. You cannot assign to a functions return value. You can assign the return value of a function to another variable like double real = creal(z1) .

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