# ### 单项循环的练习
# 1.打印一行十个小星星 help函数查看帮助文档
i = 0
while i<10:
print("☆",end="")
i+=1
for i in range(10):
print("☆",end="")
# 2.通过打印变量实现一行十个小星星
strvar = ("")
i = 0
while i<10:
strvar+="☆"
i+=1
print(strvar)
# 3.打印一行十个小星星,奇数个位★,偶数个位☆
i = 0
while i<10:
if i%2==1:
print("★",end="")
if i%2==0:
print("☆",end="")
i+=1
# 4.一个循环打印十行十列的小星星
for i in range(100):
print("☆",end="")
if i %10==9:
print()
# 5.一个循环打印十行十列隔列换色的小星星
for i in range(100): if i %2==0: print("★",end="") elif i %2==1:
print("☆",end="") if i %10==9: print()
# 6.一个循环打印十行十列隔行换色的小星星
for i in range(100):
if i //10%2 ==0:
print("★",end="")
else:
print("☆",end="")
if i %10==9:
print()
## 双向循环的经典练习
# 1.打印十行十列小星星(2个循环)
while循环
i = 0
while i<10:
j = 0
while j<10:
print("★",end="")
j+=1
print()
i+=1
for循环
for i in range(10):
for j in range (10):
print("☆",end="")
print()
# 2.打印十行十列小星星(搁列换色小星星)
while循环
i = 0
while i<10:
j = 0
while j<10:
if j%2==0:
print("☆",end="")
else:
print("★",end="")
j+=1
print()
i+=1
for循环
for i in range(10):
for j in range(10):
if j%2==0:
print("☆",end="")
else:
print("★",end="")
print()
# 3.打印十行十列小星星(搁行换色小星星)
while循环
i=0 while i<10: j = 0
while j<10: if i%2==0: print("☆",end="") else: print("★",end="") j+=1 print() i+=1
for循环
for i in range(10):
for j in range(10):
if i%2 == 0:
print("☆",end="")
else:
print("★",end="")
print()
# 4.99乘法表
#方法一
while循环
i = 1 while i<=9: j=1 while j<=i: print("%d*%d=%2d"%(i,j,i*j),"",end="")
j+=1 print() i+=1
for循环
for i in range(1,10):
for j in range (1,i+1):
print("%d*%d=%2d"%(i,j,i*j),"",end="")
print()
# 方法二
while循环
i = 9
while i>0:
j = 1
while j<=i:
print("%d*%d=%2d"%(i,j,i*j),"",end="")
j+=1
print()
i-=1
for循环
for i in range(9,0,-1):
for j in range (1,i+1):
print("%d*%d=%2d"%(i,j,i*j),"",end="")
print()
# 方法三
while循环
i = 1
while i<=9:
k=9-i
while k>0:
print(" ",end="")
k-=1
j=1
while j<=i:
print("%d*%d=%2d"%(i,j,i*j),"",end="")
j+=1
print()
i+=1
for循环
for i in range(1,10):
for k in range(1,10-i):
print(" ",end="")
for j in range(1,i+1):
print("%d*%d=%2d"%(i,j,i*j),"",end="")
# 方法四
while循环
i = 9
while i >0:
k = 9-i
while k >0:
print(" ",end="")
k-=1
j = 1
while j<=i:
print("%d*%d=%2d"%(i,j,i*j),"",end="")
j+=1
print()
i-=1
for循环
for i in range(9,0,-1):
for k in range (1,10-i):
print(" ",end="")
for j in range(1,i+1):
print("%d*%d=%2d"%(i,j,i*j),"",end="")
print()
#5.吉利数字 100~999
# 方法一
while循环
i = 100
while i<1000:
gewei = i%10
shiwei = i // 10 %10
baiwei = i // 100
if gewei == shiwei and shiwei == baiwei:
print(i)
elif shiwei == gewei-1 and shiwei == baiwei + 1:
print(i)
elif shiwei == gewei+1 and shiwei == baiwei - 1:
print(i)
i+=1
for循环
for i in range(100,1000):
gewei = i % 10
shiwei = i // 10 % 10
baiwei = i //100
if shiwei == gewei+1 and shiwei == baiwei - 1:
print(i)
elif shiwei == baiwei ==gewei:
print(i)
elif shiwei == gewei-1 and shiwei == baiwei +1:
print(i)
# 方法二
while循环
i = 100
while i<1000:
strvar = str(i)
baiwei = int(strvar[0])
shiwei = int(strvar[1])
gewei = int(strvar[2])
if gewei == shiwei and shiwei == baiwei:
print(i)
elif shiwei == gewei-1 and shiwei == baiwei + 1:
print(i)
elif shiwei == gewei+1 and shiwei == baiwei - 1:
print(i)
i+=1
for循环
for i in range(100,1000):
strvar = str(i)
baiwei = int(strvar[0])
shiwei = int(strvar[1])
gewei = int(strvar[2])
if gewei == shiwei and shiwei == baiwei:
print(i)
elif shiwei == gewei-1 and shiwei == baiwei + 1:
print(i)
elif shiwei == gewei+1 and shiwei == baiwei - 1:
print(i)
i+=1
#6.百钱买百鸡
公1元1只 母3元1只 小5毛一只
100元买100只鸡有多少种买法?
while循环
gongji = 0
num = 0
while gongji <=100:
muji = 0
while muji <=33:
xiaoji = 0
while xiaoji<=100:
if gongji+xiaoji+muji==100 and gongji*1+xiaoji*0.5+muji*3==100:
num+=1
print(gongji,xiaoji,muji)
xiaoji+=1
muji+=1
gongji+=1
print(num)
for循环
num = 0
for gongji in range(101):
for muji in range(34):
for xiaoji in range(100):
if gongji + muji +xiaoji==100 and gongji*1+muji*3+xiaoji*0.5==100:
num+=1
print(gongji,muji,xiaoji)
print(num)
#7.(升级题)打印菱形小星星
*
***
*****
*******
*********
***********
***********
*********
*******
*****
***
*
while循环
i = 1
while i <=6:
k = 6-i
while k>0:
print(" ",end="")
k-=1
j = 2*i-1
while j>0:
print("*",end="")
j-=1
print()
i+=1
i = 6
while i >0:
k = 6-i
while k>0:
print(" ",end="")
k-=1
j=2*i-1
while j>0:
print("*",end="")
j-=1
print()
i-=1
for循环
for i in range(1,7):
for k in range(1,7-i):
print(" ",end="")
for j in range(1,2*i):
print("*",end="")
print()
for i in range (6,0,-1):
for k in range(0,6-i):
print(" ",end="")
for j in range(1,2*i):
print("*",end="")
print()