Question

I need to write a c++ segment to calculate the phase angle of a complex number on the interval [0, 2pi). The segment needs to return -1 when the phase is undefined. I am having trouble figuring out how to adjust a number outside of the interval and get it into the interval (i.e. add 2pi, add pi, etc). This is what I have so far:

   if (real == 0 && imag==0)
   {
       return -1;
   }
   else if (real > 0 && imag < 0)
   {
       return ((2*M_PI) + atan2(imag, real));
   }
   else
   {
       return atan2(imag, real);
   }

but it is not passing my instructor's tests

Answer 1

Just use:  

if (real == 0 && imag==0)
{
   return -1;
}
else if (atan2(imag, real) < 0)
{
   return ((2*M_PI) + atan2(imag, real));
}
else
{
   return atan2(imag, real);
}

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