While loop 1

x=10
while x>= 0:
    x=x-1 #controller, otherwise 無限loop
    if x%2:# %:Remainder, 餘數
        x=-1
        continue #go back to top
    if x==4:
        break #end/exit loop
    print(x)
    
else:
    print("This line will run when while loop is false.")