def test_mult_zero():
a = 15
b = 0
calc = Calc()
assert calc.mult(a, b) == 0
from calc import Calc
c=Calc()
x=c.add(5,7)
y=c.sub(5,7)
z=c.mult(5,7)
a=c.div(20,3)
b=c.mod(20,3)
print("user 2 made this change")
print(f"the diff between 5 and 7 is {y}")
print(f"the product of 5 and 7 is {z}")
print(f"the div of 20 / 3 is {a}")
print(f"the modulus of 20 / 3 is {b}")
print("user 1 made this change")
print("user 2 made this change")
print("milomia 2 made this change")
print("milomia made this change")
