While在Python中有2個變量的循環

Question

在以下語句後，y的值是多少？

x = 100 
y = 0 
while x > 50: 
    y = y + 1 
    x = x - 1 

我遇到了涉及2個變量的問題。

Answer 1

逐步完成循環的前幾次迭代，查找模式並進行外插。

x = 100   # x = 100 
y = 0   # x = 100 y = 0 
if x > 50:  # x = 100 y = 0 
    y = y + 1 # x = 100 y = 1 
    x = x - 1 # x = 99 y = 1 
if x > 50:  # x = 99 y = 1 
    y = y + 1 # x = 99 y = 2 
    x = x - 1 # x = 98 y = 2 
if x > 50:  # x = 98 y = 2 
    y = y + 1 # x = 98 y = 3 
    x = x - 1 # x = 97 y = 3 
if x > 50:  # x = 97 y = 3 
    y = y + 1 # x = 97 y = 4 
    x = x - 1 # x = 96 y = 4 
if x > 50:  # x = 96 y = 4 
    y = y + 1 # x = 96 y = 5 
    x = x - 1 # x = 95 y = 5 
if x > 50:  # x = 95 y = 5 
    y = y + 1 # x = 95 y = 6 
    x = x - 1 # x = 94 y = 6 
... 
if x > 50:  # x = 52 y = 48 
    y = y + 1 # x = 52 y = 49 
    x = x - 1 # x = 51 y = 49 
if x > 50:  # x = 51 y = 49 
    y = y + 1 # x = 51 y = 50 
    x = x - 1 # x = 50 y = 50 
if x > 50:  # x = 50 y = 50 
(false, end process)