python 循环练习
Demo37 循环猜0--100的数字根据提示猜对为止
import random
sum = int(input("请输入一个0到100的整数包括0和100："))
a = random.randint(0,100)
while sum != a:
if sum > a:
print("数字过大请输入一个更小的数：")
sum = int(input("请输入一个0到100的整数包括0和100："))
elif sum < a:
print("数字过小请输入一个更大的数：")
sum = int(input("请输入一个0到100的整数包括0和100："))
else :
print("你猜对了")
Demo38 找两个整数最大公约数
(n1,n2) = eval(input("请输入两个整数："))
gcd = 0
k = 2
if n1 ==n2 :
print("最大公约数是1")
elif n1 != n2 :
if n1 > n2 :
while k <= n2 :
if n1 % k == 0 and n2 % k == 0 :
gcd = k
k += 1
else :
k +=1
print("(%s,%s)的最大公约数是：%s"%(n1,n2,gcd))
if n1 < n2 :
while k <= n1 :
if n1 % k == 0 and n2 % k == 0 :
gcd = k
k += 1
else :
k += 1
print("(%s,%s)的最大公约数是：%s"%(n1,n2,gcd))
Demo39 蒙卡罗模拟--圆周率
import math
import random
i = 0
numberhits = 0
while i < 1000000:
x = random.random()*2-1
y = random.random()*2-1
i += 1
if math.sqrt(x**2+y**2)<=1.0:
numberhits += 1
else:
numberhits=numberhits
continue
else:
pi = 4*numberhits/1000000
print(pi)
Demo40 统计正负数个数并计算平均值
num = int(input("输入一个整数："))
i = 0
j = 0
k = 0
num1 = 0
num2 = 0
sum1 = 0
sum2 = 0
everage = 0
while num != 0:
if num > 0:
sum1 += num
j +=1
if num < 0:
sum2 += num
k +=1
num = int(input("输入一个整数："))
else:
i = j + k
sum = sum2 + sum1
everage = (sum2+sum1)/i
print("正数个数为：%d"%j)
print("负数个数为：%d"%k)
print("总个数为：%d"%sum)
print("平均数值为：%s"%everage)
Demo41 找一个整数的所有因子
sum = int(input("输入一个整数："))
n = 2
while True:
if sum % n == 0:
print(n,end = " , ")
sum /= n
else :
n += 1
if sum == 1:
break
Demo42 显示一个数字金字塔
# 43两个组合
num = int(input('输入层数：'))
for i in range(1,num+1):
for j in range(0,num-i):
print(" ",end = "")
for j in range(i,0,-1):
print(j,end = "")
for j in range(2,i+1):
print(j,end ="")
print("")
Demo43 循环显示四种模式
sum = int(input("输入层数："))
print(" ")
print("#模式A")
print(" ")
for a in range(1,sum+1):
for b in range(1,a+1):
print(b,end = "")
print("")
print(" ")
print("#模式B ")
print(" ")
for c in range(1,sum+1):
for d in range(1,sum+2-c):
print(d,end = "")
print("")
print("#模式C")
print(" ")
for c in range(1,sum+1):
for d in range(1,sum+1-c):
print(" ",end = "")
for d in range(c,0,-1):#一行里 n 到 0 ，以n-1,n-2,…… ，0
print(d,end = "")
print("")
print(" ")
print("#模式D")
print(" ")
for c in range(1,sum+1):
for d in range(2,c+1):
print(" ",end = "")
for d in range(1,sum+2-c):
print(d,end = "")
print("")
Demo44 在金字塔模拟中显示数字
sum = int(input("请输入数字层数："))
for i in range(1,sum+1):
for j in range(0,sum-i):
print(" ",end ="")
for j in range(0,i):
if j == i-1 and j != i-2:
print(" %d"%(2**j ) ,end ="")
else:
print("%d"%(2**j ) ,end ="")
for j in range(i,1,-1):
print("%d"%(2**(j-2)) ,end ="")
print("")
Demo45 显示2--100的素数
n = 0
for x in range(2,1001):
for i in range(2,x):
if x % i == 0:
break
else:
print("%d "%x, end ="")
n += 1
if n % 8 == 0:
print("\n")
Demo46 -- 50
demo51 十进制到二进制
# 10 进制转换为 2 进制
a = int(input("请输入一个十进制数："))
list = ''
while a > 0:
list += str(a % 2)
a = a // 2
print("二进制数：%s"%list[::-1])
Demo52
Demo53 蒙特卡罗模拟
import random
i = 0
numhits = 0
while i < 1000000:
x = random.random()*2-1
y = random.random()*2-1
i += 1
if -1
Demo54 显示闰年（2001 -- 2100）
x = 2001
i = 0
while x<2101:
if x % 4 == 0 and x % 100 != 0 or x % 400 == 0:
print("%d "%x,end = "")
x += 1
i += 1
if i % 8 == 0:
print("\n")
continue
else:
x +=1
continue
