1-100内求和

count = 1
sum = 0
while count <= 100:
    sum = sum + count
    count +=1
print(sum)
1-100内的所有奇数

count = 1
while count < 100:
    if count % 2 != 0:
        print(count)
    count += 1
1-100内所有偶数

count = 1
while count < 100:
    if count % 2 == 0:
        print(count)
    count += 1
1-2+3-4...99的和

count = 1
sum = 0
while count <= 99:
    if count % 2 != 0:
        sum += count
    else:
        sum -= count
    count += 1
print(sum)

 

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