day3-作业

编程实现(for和while各写 遍):

1. 求1到100之间所有数的和、平均值 。

for循环：
sum = 0
for x in range(1,101):
    sum += x
print("1~100的数的和为%s" "平均值为 %.2f"% (sum,sum/100))

while循环：
sum = 0
count = 1
while count <= 100:
    sum+=count
    count+=1
print("1~100的数的和为%s \t平均值为 %.2f"% (sum,sum/100))

2. 计算1-100之间能3整除的数的和

for循环：
count = 0
for x in range(1,101):
    if x % 3 == 0:
        count+=x
print(count)

while循环：
count = 1
sum = 0
while count <= 100:
    count+=1
    if count % 3 == 0:
        sum+=count
print("1~100之间能3整除的数的和为%s" % (sum))

3. 计算1-100之间 能被7整除的数的和

for循环：
sum = 0
for x in range(1,101):
    if x % 7 == 0:
        sum+=x
print(sum)

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