阶乘公式求职

解题思路:

注意事项:

参考代码:

def fact(n):

    s = 1

    for i in range(1,n+1):

        s*=i

    return(s)

n = int(input())

a = b = 0

for i in range(1,n+1):

    a = 1/fact(i)

    b += a

print("sum=%.5f"%b)