• 讀程序，總結(jié)程序功能

numbers=1  
for i in range(0,20):  
  numbers*=2  
print(numbers)

求出2的20次方，結(jié)果為1048576

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)

找出1~100之間，能夠被3或者7整除，并且不被21整除的數(shù)，輸出符合要求的數(shù)字的個(gè)數(shù)。

• 編程實(shí)現(xiàn)(for和while各寫一遍):
  求1到100之間所有數(shù)的和、平均值

for 循環(huán)
sum = 0
for x in range(1,101):
    sum += x
sum1 = sum / 100
print(sum,sum1)

while 循環(huán)
sum = 0
x = 1
while  x <= 100:
    sum += x
    x += 1
sum1 = sum / 100
print(sum,sum1)

結(jié)果

5050 50.5

計(jì)算1-100之間能3整除的數(shù)的和

for 循環(huán)
sum = 0
for x in range(1,101):
    if x % 3 == 0:
        sum += x
print(sum)

while 循環(huán)
sum = 0
x = 1
while  x <= 100:
    if x % 3 == 0:
        sum += x
    x += 1
print(sum)

結(jié)果

1683