循环的应用

i=1
while i<=5:
    j=1
    while j<=5:
        print(‘*‘,end=‘‘)
        j+=1
    print()
    i+=1

i=1
while i<=5:
    j=1
    while j<=i:
        print(‘*‘,end=‘‘)
        j+=1
    print()
    i+=1

i=1
while i<=9:
    j=1
    while j<=i:
        print(‘%s*%s=%s\t‘%(j,i,j*i),end=‘‘)#反斜杠t表示一个tab键
        j+=1
    print()
    i+=1

import random

player=int(input(‘请输入：石头0 剪刀1 布2‘))
computer=random.randint(0,2)

if (player==0 and computer==2) or (player==1 and computer == 0) or (player == 2 and computer == 1):
    print(‘你赢了‘)
elif player == computer:
    print(‘平局‘)
else:
    print(‘你输了‘)

# 打印1到100之间的偶数
#for循环实现

for i in range(1,101):
    if i%2==0:
        print(i)
#while 循环实现

n=1
while n<=100:
    if n%2==0:
        print(n)
    n += 1

n=1
num=0
while n<=100:
    if n%2==0:
        print(n)
        num+=1
    n+=1
    if num == 20:
        break