#方法一
#從2開(kāi)始計(jì)算
i = 2
#定義一個(gè)變量用于保存結(jié)果
sum=0
while i <= 100:
    if i % 2 == 0:
        sum = sum + i
    else:
        sum = sum - i
    i += 1
print("2-3+4-5+6...+100=",sum)

#方法二
n=3
sum=2
while n<=100 :
    #n對(duì)2取余
    if n % 2 != 0:
        sum = sum - n
        n = n + 1
    else:
        sum = sum + n
        n = n + 1
print("2-3+4-5+6...+100=",sum)

n = int(input("請(qǐng)輸入一個(gè)非負(fù)的數(shù)字：")) # 負(fù)數(shù)不算階乘
def factorial(n):
    if n == 0:
        return 1  # 0的階乘是1
    else:
        return n * factorial(n - 1)
 
if __name__ == '__main__':
    result=factorial(n)
    print("{}的階乘為:{}".format(n,result))

try:
    score=float(input('請(qǐng)輸入考試成績(jī)：'))
    if score>=90:
        print('A')
    elif 80<=score<90:
        print('B')
    elif 70<=score<80:
        print('C')
    elif 60<=score<70:
        print('D')
    else:
        print('E')
except Exception as e:
    print('您輸入有誤！')

save_money = float(input("請(qǐng)輸入你要存入銀行的錢(qián)："))
print("你存了{(lán)}元到銀行".format(save_money))
total_money = save_money * 2 # 定義變量用于保存總錢(qián)數(shù)
year = 1 # 定義變量用于記錄年份
while save_money < total_money:
    save_money *= (1 + 0.0352)
    year += 1
print("定期利率為3.52%，需要{}年本金和利息才能翻一番！".format(year))

# 方法一  字符串函數(shù)調(diào)用
a = ["I","T","e","s","t","e","r"]
print("".join(a))
 
#方法二 for循環(huán)
a = ["I","T","e","s","t","e","r"]
s = ""
for item in a:
    s += item
print(s)