按位移位输出错误结果

Question

我正在完成我的信息学作业，我为我的问题写了这些：

创建一个值为 154 的变量 s 和一个值为 6 的变量 p。在屏幕上以十进制和二进制形式显示其值。

s=154
p=6
bs=bin(s)
bp=bin(p)
print("In decimal form, s =",s,"and p =",p)
print("In binary form, s =",bs[2:],"and p =",bp[2:])

将变量s和p进行按位或运算，并将结果写入变量s。将十进制和二进制形式的值输出到屏幕。

s=s|p
bsp=bin(s)
print("In decimal form, the value is",s)
print("In binary form, the value is",bsp[2:])

对变量s和p进行按位右移2位操作，并将结果记录在相应的变量中。在屏幕上以十进制和二进制形式显示值。

#print(s)
sbutshift2digit=s>>2
binsshift=bin(sbutshift2digit)
pbutshift2digit=p>>2
binpshift=bin(pbutshift2digit)
print("for the operation of bitwise shift to the right by 2 bits on the variables s, the value in decimal is",sbutshift2digit)
print("for the operation of bitwise shift to the right by 2 bits on the variables s, the value in binary is",binsshift[2:])
print("\n")
print("for the operation of bitwise shift to the right by 2 bits on the variables s, the value in decimal is",pbutshift2digit)
print("for the operation of bitwise shift to the right by 2 bits on the variables s, the value in binary is",binpshift[2:])

这是我的第三部分代码的结果：

for the operation of bitwise shift to the right by 2 bits on the variables s, the value in decimal is 39
for the operation of bitwise shift to the right by 2 bits on the variables s, the value in binary is 100111


for the operation of bitwise shift to the right by 2 bits on the variables s, the value in decimal is 1
for the operation of bitwise shift to the right by 2 bits on the variables s, the value in binary is 1

问题是，对于变量s按位右移2位的操作，十进制的值应该是38，而不是39。 我真的不知道出了什么问题......

Answer 1

你正在覆盖你的变量。执行按位

OR

后，变量

s

现在为 158，而不是 154。然后，您将对这个新值而不是原始值执行位移。要修复它，您只需在操作之间重置

s

和

p

：

s = 154
p = 6
bs = bin(s)
bp = bin(p)
print("In decimal form, s =", s, "and p =", p)
print("In binary form, s =", bs[2:], "and p =", bp[2:])

# Perform a bitwise OR operation on the variables s and p
s = s | p
bsp = bin(s)
print("In decimal form, the value is", s)
print("In binary form, the value is", bsp[2:])

# Reset your variables
s = 154
p = 6
bs = bin(s)
bp = bin(p)

# Perform the operation of bitwise shift to the right by 2 bits on the variables s and p
sbutshift2digit = s >> 2
binsshift = bin(sbutshift2digit)
pbutshift2digit = p >> 2
binpshift = bin(pbutshift2digit)
print("For the operation of bitwise shift to the right by 2 bits on the variable s, the value in decimal is", sbutshift2digit)
print("For the operation of bitwise shift to the right by 2 bits on the variable s, the value in binary is", binsshift[2:])
print("\n")
print("For the operation of bitwise shift to the right by 2 bits on the variable p, the value in decimal is", pbutshift2digit)
print("For the operation of bitwise shift to the right by 2 bits on the variable p, the value in binary is", binpshift[2:])