#! /usr/bin/python3
# ===================================================================
# test the trigonometric sine function
# ===================================================================

import numpy as np
import sys
import user_interface as ui

# -------------------------------------------------------------------
# ---- main
# -------------------------------------------------------------------

if __name__ == '__main__':

    if not ui.running_python3():
        print()
        print('Must run Python3')
        sys.exit()

    while True:

        print()
        a = ui.get_user_input('Enter an angle (degrees): ')

        if not a:                        # empty string?
            print()
            break

        if not ui.is_a_number(a):        # number?
            print()
            print('Error: Bad input')
            continue

        deg = float(a) % 360.0           # degrees

        rad = np.deg2rad(deg)            # radians

        print()
        print(f'deg: {deg}')
        print(f'rad: {rad}')
        print(f'sin: {np.sin(rad)}')