using c++ in visual studio 2017

The period of one swing of a simple pendulum is given by where (in metric units), T = period (sec), l = length of pendulum (m), g = gravitational acceleration = 9.81 m/sec^?2 Write a program capable of completing the following table:

Length (m)	Period (sec)
0.5	----
1.0	----
----	10.0
----	20.0
0.32	----

Input specifications: Prompt the user to input the data from the screen.

Output specifications: Print the completed table on the screen

T = 2T /9