#方法一 #从2开始计算 i = 2 #定义一个变量用于保存结果 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对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)
运行结果:
提示:
1!等于1
2!等于1*2
3!等于1*2*3
n!等于1*2*3*...*n
n = int(input("请输入一个非负的数字:")) # 负数不算阶乘 def factorial(n): if n == 0: return 1 # 0的阶乘是1 else: return n * factorial(n - 1) if __name__ == '__main__': result=factorial(n) print("{}的阶乘为:{}".format(n,result))
try: score=float(input('请输入考试成绩:')) 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('您输入有误!')
save_money = float(input("请输入你要存入银行的钱:")) print("你存了{}元到银行".format(save_money)) total_money = save_money * 2 # 定义变量用于保存总钱数 year = 1 # 定义变量用于记录年份 while save_money < total_money: save_money *= (1 + 0.0352) year += 1 print("定期利率为3.52%,需要{}年本金和利息才能翻一番!".format(year))
# 方法一 字符串函数调用 a = ["I","T","e","s","t","e","r"] print("".join(a)) #方法二 for循环 a = ["I","T","e","s","t","e","r"] s = "" for item in a: s += item print(s)