while循环语句

while循环语句

 

while 循环：条件循环

while  表达式：

   循环语句

# 无限循环

while 1:
    name = input("用户名:")
    pwd = input("密码:")
    if name = "rain" and pwd == "123"
        print("登录成功！")
    else:
        print("登录失败")
        
# 打印100次ok
count = 0  # 初始语句
while count < 10:  # 判断条件
     print("ok")
    count += 1  # 步进语句： count = count + 1


# 打印100次ok或者1-100

count = 0  # 初始语句
while count < 100:  # 判断条件
    count += 1  # 步进语句： count = count + 1
    print(count)


# 方式1: 打印100-1
count = 0  # 初始语句
while count < 100:  # 判断条件
    print(100-count)
     count += 1  # 步进语句： count = count - 1


# 方式2: 打印100-1
count = 100  # 初始语句
while count > 0:  # 判断条件
    print(count)
    count -= 1  # 步进语句： count = count - 1
    
    

    
# 3个知识点：1.变量赋值 2.自增运算 3.for循环
# 1+2+3+4+5+6+100的和

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