"""
while

"""


# print out a greeting sentence for 10 times

# 10
# print("Hello world!")
# print("Hello world!")
# print("Hello world!")
# print("Hello world!")
# print("Hello world!")
# print("Hello world!")
# print("Hello world!")
# print("Hello world!")
# print("Hello world!")
# print("Hello world!")


# for-loop
for i in range(10):
    print("Hello world!")
print()

# while-loop
i = 0
while i<10:
    print("Hello world!")
    print("Hello Sihe and Zilin!")
    i = i + 1

