print('--- # round # ---')
print(round(2.4))
print(round(2.7))
print(round(2.5))

print('---------')

# -----------------------

import math  # built-in lib

print('--- # floor # ---')
print(math.floor(1.2))
print(math.floor(1.7))

print('---------')

print('--- # ceil # ---')
print(math.ceil(1.2))
print(math.ceil(1.7))

print('---------')

# -----------------------

print('--- # sin # ---')
print(math.pi)
print(math.sin(math.pi / 2))
print(math.sin(math.radians(90)))

print('---------')

print('--- # asin # ---')
print(math.asin(1))

print('---------')

# -----------------------

print('--- # pow # ---')
print(2**10)
print(math.pow(2, 10))  # better performance