python自学笔记1-求1-100的和

求1-100的和

>首先定义一个索引变量
start = 1
>定义一个变量记录每次的的和
sum = 0
while True:
    print(start)
    sum = sum + start
    print(sum)
    if start == 100:
        break
    start += 1

输出1-100的内所有奇数

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

输出1-100的内所有偶数

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

求1-2+3-4+5-6.....99 所有数的和

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自学笔记1-求1-100的和

原文：https://www.cnblogs.com/wwxj/p/10567532.html