Programmatic initialization of a long array at compile or initialization time

Question

Here is a code snippet illustrating my question:

const float D    = 0.1F;
const float A[4] = {sin(0*D), sin(1*D), sin(2*D), sin(3*D)};

Imagine that global array A is much longer and you don't want to do all of this repetitive typing. Is there a shorter way to initialize array A at compile or initialization time, i.e. without having to write initialization function and call it somewhere in my program?

Answer 1

You could initialize A during dynamic initialization time as follows:

const float *init_a(float x_)
{
  static float data[4];
  for(unsigned i=0; i<4; ++i)
    data[i]=sin(i*x_);
  return data;
}

const float D=0.1f;
const float *A=init_a(D);