viết chương trình nhập hai số a, b in ra màn hình tổng, hiệu, tích, thương, tổng bình phương hai số, hiệu bình phương hai số

File i/o activity objective: the objective of this activity is to practice working with text files in c#. for this activity, you may do all code in the main class. instructions: create an app that will read integers from an input file name numbers.txt that will consist of one integer per record. example: 4 8 25 101 determine which numbers are even and which are odd. write the even numbers to a file named even.txt and the odd numbers to a file named odd.txt.