第五课 while循环

#1. 使用while循环输出1 2 3 4 5 6 8 9 10
n = 1
while n <= 10:
    if n == 7:
        pass
    else:
        print(n)
    n = n + 1

#2. 求1 ~100所有数的和

n = 1
count = 0
while n <= 100:
    count = count + n
    n = n + 1
print(count)

# 3. 输出 1~100 内的所有奇数

n = 1
while n < 100:
    if n % 2 != 0:
        print(n)
    else:
        pass
    n = n + 1

# 4. 输出1~100以内的所有偶数

n = 1
while n < 100 :
    if n % 2 == 0:
        print(n)
    else :
        pass
    n = n + 1

#5. 求1-2+3-4+5-6...99的所有数的和

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