试手

#使用while循环输入1,2,3,5,6, ,8,9,10
'''
count =0
while count<10:
    count =count+1
    if count==7:
        print(' ')
    else: print(count)
    '''
#求1-100以内所有数的和
'''count=0
sum=0
while count<100:
    count=count+1
    sum=sum+count 
    print(count,sum)
    '''
#输出1-100内所有的奇数
'''
count=0
while count<100:
    count=count+1
    if count%2!=0:
        print (count)
'''
#输出1-100内所有的偶数
'''
count=0
while count<100:
    count=count+1
    if count%2==0:
        print (count)
'''
#求1-2+3-4-5。。。。。99的和
#（第一种方法）
'''count=0
k=1
sum=0
while count<=99:
    count=count+1
    k=k*(-1)
    sum=sum+count*k
print(sum)
'''
#(第二种方法)
'''count=0
sum=0
while count<=99:
    if(count%2==0):
        sum=sum-count 
    else: sum=sum+count 
    count=count+1
print(sum)    
'''