不間斷 Python 挑戰 Day 11 - while 迴圈

while 迴圈

while condition1:
Do A

# for loop
for i in range(10):
print(i, end=" ")

# while loop
i = 0
while i < 10:
print(i, end=" ")
i += 1

0 1 2 3 4 5 6 7 8 9

principal = 10000
year = 0
interest_rate = 0.01

while principal < 20000:
principal = principal * (1 + interest_rate)
year += 1

print(year)

70

input_chr = ""
while input_chr != "q":
input_chr = input("輸入q結束：")

輸入q結束：a
輸入q結束：f
輸入q結束：e
輸入q結束：g
輸入q結束：q

巢狀while迴圈 (Nested while loop)

while condition1:
while condition2:
Do something

i = j = 1
while i < 10:
while j < 10:
print("%d*%d=%-4d" % (i, j, i * j), end=" ")
j += 1
i += 1
j = 1
print()

無窮迴圈

# while True:
# Do something

break指令

while condition1:
Do A
if condition2:
Do B
break
Do C

input_chr = ""
while True:
input_chr = input("輸入q結束：")
if input_chr == "q":
break

continue指令

while condition1:
Do A
if condition2:
Do B
continue
Do C

i = 0
odd_list = []
while i < 10:
i += 1
if i % 2 == 0:
continue
odd_list.append(i)
print(odd_list)

[1, 3, 5, 7, 9]

else指令

while condition1:
Do A
else:
Do B

i = 0
odd_list = []
while i < 10:
i += 1
if i % 2 == 0:
continue
odd_list.append(i)
else:
print(f"End of counting odd number to {i-1}")
print(odd_list)

End of counting odd numbers to 9
[1, 3, 5, 7, 9]

程式範例