100以内奇数的和
sum =0
n =99
while n>0 :
sum =sum+n
n =n-2
print(sum )
打字符题
h =int(input("请输入你想打印的行数:"))
n = 1
while n <h :
print(n*'*')
n +=1
等腰三角形
layer = int(input("请输入你要打印的行数："))
for i in range(1,layer+1):
spce_num = layer -i
for j in range(0,spce_num):
print(" ",end="")
star_num = 2*i-1
for j in range(0,star_num):
print("*",end=""）
print(" ")
对称的等腰三角形
layer = int(input("请输入你打印的层数;"))
for i in range(1,layer+1):
spce_num =layer -1
for i in range(0,star_num):
print(" ",end="")
star_num = 2*1-1
for j in range(0,star_num):
print(" ",end ="")
print("")
while layer % 2 == 0 :
layer = int(input("请输入正确的打印的行数，注意是奇数:"))
for i in range(1,layer// 2+3):
spce_num = layer-1
for i in range(0,spce_num):
print(" ",end="")
star_num = 2*i-1
for j in range(0,star_num):
print("*",end="")
print("")
for i in range(layer//2,0,-1):
spce_num =layer -i
for j in range(0,spce_num):
print(" ",end="")
star_num = 2*i-1
for i in range(0,star_num):
print("*",end="")
print("")
计数排序
arr =[7,3,2,0,3,2,1,6]
max_num =arr[0]
min_num =arr[0]
for num in arr:
if num>max_num:
max_num =num
elif num<min_num:
min_num =num
offest = min_num
len_arr1 =max_num - min_num +1
arr1 =[0]*len_arr1
arr2 =[0]*len(arr)
for num in arr:
print(num)
arr1[num-offest]+=1
print(arr1)
index=0
for i in range(0,len_arr1):
for j in range(0,arr1[i]):
arr2[index] = i+offest
index +=1
print()
print(arr2)
交换变量
num1 = int(input("请输入第一个数:"))
num2 = int(input("请输入第二个数:"))
#方法一：使用中间变量
temp = num1
num1 = num2
num2 = temp
print("交换后,num1 = %s num2 = %s"%(num1,num2))
#方法二：求和法
num1 = num1 + num2
num2 = num1 - num2
num1 = num1 - num2
print("交换后,num1 = %s num2 = %s"%(num1,num2))
#方法三：以后交换法（python独有的）寄存器
num1,num2 = num2,num1
print("交换后,num1 = %s num2 =%s"%(num1,num2))
九九乘法表
a = 1
while a <= 9 :
b = 1
while b <= a:
print("%s*%s=%s"%(a,b,a*b),end="\t")
b+=1
print('')
a+=1
