课后练习

Posted 2021-01-24 jjdkd

1.

print("菜单".center(30,‘#‘))

a=(‘1.鲁班 ‘
‘2.程咬金 ‘
‘3.刘备‘)
print(a)
choice=int(input("请输入你的选项："))

if choice==1:
print("鲁班")
elif choice==2:
print("程咬金")
else:
print("刘备")
2.

year=int(input("请输入年分："))
mouth=int(input("请输入月分："))

if mouth==2:
if year%4==0 and year%100!=0 or year%400==0:
print("29天")
else:
print("28天")
else:
if mouth==(1 or 3 or 5 or 7 or 8 or 10 or 12):
print("31天")
else:
print("30天")
3.

import math

a=float(input("input number:"))
b=float(input("input number:"))
c=float(input("input number:"))


delta=b**2-4*a*c
if delta>0:
x1=(-b+math.sqrt(b**2-4*a*c))/2*a
x2=(-b-math.sqrt(b**2-4*a*c))/2*a
print(x1x2)
elif delta==0:
x=-b/2*a
print(x)
else :
print("no answer")
4.

mouth=int(input("请输入月份："))

if 3<=mouth<=5:
print("春季")
elif 6<=mouth<=8:
print("夏季")
elif 9<=mouth<=11:
print("秋季")
else:
print("冬季")
 

5.

a=input("请输入")

if a=="":
print("erro")
else:

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作者：qq_41911569
来源：CSDN
原文：https://blog.csdn.net/qq_41911569/article/details/81627934
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