(语言-python)

Question

import math
n=1
i=1
for i in range(1,abs(i/1)<1e-6):
    q=(-1)**(n-1)
    p+=(i/1)*q
    n+=1
    i+=2
a=4*p
print(a)

题目要求近似算出pi的值，pi/4=1-1/3+1/5-1/7+1/9-..，要求最后一项绝对值小于1e-6

Answer 1

流程图

代码

sum = 0
n = 1
add_flag = True
lis = 1.0 / n
while (lis >= pow(10,-6)):
    if(add_flag):
        sum += lis
    else : 
        sum -= lis
    n+=2
    lis = 1.0/n
    add_flag = not add_flag

print(sum*4)