python基础-day1-while循环

count = 1
result = 0
计算1-100
while count <= 100:
    result += count
    count += 1
    print(result)
    
    
   
while count <= 100:
    result = result + count
    count = count + 1
    print(result)

while True:
    result += count
    if count > 100:
        break
    count += 1
    print(result)

while count <= 100:
    count += 1
    if count == 80:
        print("count 等于 %d 跳""出本次循环" % count)
        continue
    print(count)


1. 使用while 循环输入1 2 3 4 5 6 8 9 10
count = 0
while count < 10:
    count += 1
    if count == 7:
        continue
    print("%d" % count)

2. 求1-100的所有奇数

count = 0
while count < 100:
    count += 1
    if count % 2 != 0:
        # print("odd number:%d" % count)
        result += count
else:
    print("1~100偶数之和: %d" % result)


3. 求1-100的所有偶数

count = 0
result = 0
while count < 100:
    count += 1
    if count % 2 == 0:
        # print("even number: %d " % count)
        result += count
else:
    print("1~100 奇数之和%d" % result)


4.用1-2+3-4+5...99的所有数的和

count = 1
result = 0
sum_odd = 0
sum_even = 0
while count < 100:
    count += 1
    if count % 2 != 0:
        # print("%d" % count)
        sum_odd += count
    elif count % 2 == 0:
        sum_even += count
else:
    result = sum_even - sum_odd
    print("%d-%d=%d" % (sum_even, sum_odd, result))

count = 1
result = 0
while count < 100:
    count += 1
    # 偶数
    if count % 2 == 0:
        result += count
    # 奇数
    else:
        result -= count

print(result)


5.用户登陆（三次机会重试）

count = 1
while count <= 3:
    count += 1
    user_name = input("请输入你的用户名:")
else:
    print("输入错误超过3次，请稍后再试")



先定义计数器
while 条件
    count += 1  #计数器 + 1
    执行语句
else:
    上次正常执行完成后，再执行语句