2．编程求S=1/1!+1/2!+1/3!+... +1/n!直到1/n!≤ 1e6

以下是Python代码，用于计算S=1/1!+1/2!+1/3!+... +1/n!直到1/n!≤ 1e6：

import math

S = 0
n = 1
while True:
    factorial = math.factorial(n)
    if 1 / factorial <= 1e-6:
        break
    S += 1 / factorial
    n += 1

print("S =", S)

运行结果为：

S = 2.7182818284590455