Python第一课：作业

 

"""输出除7以外的1-9数字"""
n = 0
while n < 10:
    if n == 7:
        pass
    else:
        print(n)
    n = n + 1
print("----end----")

"""1-100求和"""
1 n = 0
n2 = 0
while n < 100:
    n = n + 1
    n2 = n + n2
print(n2)

 

"""输出1-100中的偶数"""
n = 1
while n < 101:
    s = n % 2
    if s == 0:
        print(n)
    else:
        pass
    n = n +1

 

"""求和1-2+3-4....99"""

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