PROGRAMMING:pi
Calculate the approximate value of π using the following formula, until the last item <10-6
pi/4 ~= 1- 1/3 + 1/5 -1/7 +……
### Output:
The value of pi, just a number remaining 6 digits after decimal point.
answer：If there is no answer, please comment
pi/4 ~= 1- 1/3 + 1/5 -1/7 +……
### Output:
The value of pi, just a number remaining 6 digits after decimal point.
answer：If there is no answer, please comment