Convert negative angle to positive: Involves invalid operand use

Question

I am attempting to convert a negative angle (in degrees) to positive. But I am getting a compile error saying:

test.cpp invalid operands of types 'double' and 'int' to binary 'operator%'
test.cpp invalid operands of types 'float' and 'int' to binary 'operator%'

My code:

double to_positive_angle(double angle)
{
   return ((3600000 + angle) % 360);
}

float to_positive_angle(float angle)
{
   return ((3600000 + angle) % 360);
}

Its obviously because I am trying to use the Modulus operator on a Float and Double.

Are the any ways I can successfully convert a negative angle (float) to a positive one (float)? Or ways that I can overcome the modulus compile error?

Answer 1

This version works for all possible inputs, not just ones greater than 3600000, and solves the % issue you were experiencing.

double to_positive_angle(double angle)
{
   angle = fmod(angle, 360);
   if (angle < 0) angle += 360;
   return angle;
}