求1-100的和

>首先定義一個索引變量
start = 1
>定義一個變量記錄每次的的和
sum = 0
while True:
    print(start)
    sum = sum + start
    print(sum)
    if start == 100:
        break
    start += 1

輸出1-100的內所有奇數

start = 1
while True:
    if start % 2 != 0:
        print(start)
    if start == 100:
        break
    start += 1

輸出1-100的內所有偶數

start = 1
 
while True:
    if start % 2 == 0:
        print(start)
    if start == 100:
        break
    start += 1

求1-2+3-4+5-6.....99 所有數的和

start = 1
sum = 0
while True:
    if start % 2 == 0:
        sum = sum - start
    else:
        sum = sum + start
    print(sum，start)
    print(start)
    if start == 99:
        break
 
    start += 1

python自學筆記1-求1-100的和