Pi=3.14
r=float(input(""请输入圆的半径r：""))
s=Pi*r**2
print(s)
l=eval(input(""请输入长方形的长度l:""))
h=eval(input(""请输入长方形的宽度h:""))
s=l*h
print(s)
year=int(input('请输入年份：'))
month=int(input('请输入月份：'))
if month==2:
if year%4==0 and year%100!=0 or year%400==0:
print('闰年29天')
else:
print('平年28天')
elif month in (4,6,9,11):
print('30天')
else:
print('31天')
score=eval(input('请输入成绩:'))
if 0<=score<=100:
if score>=90:
print('级别A')
elif score>=80:
print('级别B')
elif score>=60:
print('级别C')
elif score<60:
print('级别D')
else:
print('成绩输入有误')
str1=input(""请输入任意字符串："")
num=0
for i in str1:
if i.islower():
num+=1
print(num)
a=int(input(""请输入第一个整数""))
b=int(input(""请输入第二个整数""))
c=int(input(""请输入第三个整数""))
d=int(input(""请输入第四个整数""))
e=int(input(""请输入第五个整数""))
list1=[a,b,c,d,e]
list1.sort(reverse=True)
print(""按从大到小排列:"")
print(list1)
for x in range(100,1000):
a=x//100
b=(x%100)//10
c=x%10
if a**3+b**3+c**3==x:
print(x)
b=0
for i in range(100,1001):
if i%7==3 and i%5==3:
b=b+1
print(i)
while b==2:
quit
k=0
a=1
while True:
a=2*a+1
k+=1
if k==5:
print(a)
s=44
t=0
for i in range(1,100):
s=s-5
t=t+1
if s>0:
s=s+3
else:
print(t)
break
import math
def prime(x):
for i in range(2,int(math.sqrt(x)+1)):
if x%i==0:
return'不是素数'
else:
return'是素数'
x=int(input(""请输入一个数，判断是否为素数：""))
print(prime(x))
def nx(s):
a=s.split()
b=a[::-1]
print(''.join(b))
s=str(input(""请输入一个英文句子：""))
(nx(s))
"year = int(input(""年：""))
while True:
month = int(input(""月：""))
if 1 <= month <= 12:
while True:
day = int(input(""日：""))
days = 0
months_1 = [0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
months_2 = [0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
if (year