day04homework

基础 读程序，总结程序的功能:

1. numbers=1

   for i in range(0,20):

   numbers*=2
   print(numbers)

   1048576
   

2. summation=0

   num=1

   while num<=100:

   if (num%3==0 or num%7==0) and num%21!=0:

   summation += 1

   num+=1

   print(summation)

39

编程实现(for和while各写一遍):

3. 求1到100之间所有数的和、平均值

num=0
while num<=100:
    sum+=num
    num+=1
print(sum)
ave=sum/100
print(ave)
for x in range(101):
    sum+=x
print(sum)
ave=sum/100
print(ave)

4. 计算1-100之间能3整除的数的和

sum=0

for x in range(101):
    sum+=x
print(sum)
ave=sum/100
print(ave)
num=0
while num<=100:
    sum+=num
    num+=1
print(sum)

5. 计算1-100之间不能被7整除的数的和
   ​```python
   sum=0
   for x in range(1,101):
   if(x % 7!=0):
   sum+=x
   print(sum)