day-5作业（循环与分支）

1. 求1到100之间所有数的和、平均值

num = 1
sum1 = 0
while num <= 100:
    sum1 += num
    num += 1

print(sum1)

avg=sum1/100
print(avg)

![K`SU8{%I01A6T55NQ@@_]UY.png](https://img.haomeiwen.com/i14228690/d78054c5e108f681.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)

sum1 = 0
for x in range(1,101):
    sum1 += x

print(sum1)
avg=sum1/len(range(1,101))
print(avg)

5(5)M%G7SEIZOQ(FC6MH$~9.png

2. 计算1-100之间能3整除的数的和

sum1=0
for x in range(1,101):
    if x %3==0:

        sum1+=x
        x+=1
print(sum1)

n = 100
num = 1
sum1 = 0

while num <= n:
    if num %3== 0:
        sum1+=num   
    num += 1
print(sum1) 

39J7D2_$`B%80G{3{S3V13U.png

3. 计算1-100之间 不能被7整除的数的和

sum1=0
for x in range(1,101):
    if x %7==1:

        sum1+=x
        x+=1
print(sum1)

QQ图片20180929205408.png

num=0
while num<=100:
    if num%7==1:
        sum1+=num
    num+=1
print(sum1)

QQ图片20180929205408.png