How to rotate a dashed line in 8steps of like 45 degrees until it covers 360 degrees using C++ programming language.

Question

Rotation

Answer 1

You mean like this?
First step: |
Next step: /
Next step: -
Next step: \
Next step: |

Answer 2

There are two things that can be done:
1. You can fix the line at a point and change coordinates of it accordingly.
2. Use the rotation matrix to show rotation up to any limit.

(Rotation matrix R={cosA, -sinA, sinA, cosA})