using System; class Choose { protected int x, y; public virtual void print() { Console.Out.WriteLine("x = {0} and y = {1}", x, y); } } class Subtraction : Choose { private int result; public void sub() { Console.Write("\n\nEnter first number: "); x = Convert.ToInt32(Console.ReadLine()); Console.Write("Enter second number: "); y = Convert.ToInt32(Console.ReadLine()); result = x - y; } public override void print() { Console.Out.WriteLine("\n{0} - {1} = {2}", x, y, result); } } class Addition : Choose { private int result; public void sum() { Console.Write("\n\nEnter first number: "); x = Convert.ToInt32(Console.ReadLine()); Console.Write("Enter second number: "); y = Convert.ToInt32(Console.ReadLine()); result = x + y; } public override void print() { Console.Out.WriteLine("\n{0} + {1} = {2}", x, y, result); } } class Division : Choose { private int result; public void div() { Console.Write("\n\nEnter first number: "); x = Convert.ToInt32(Console.ReadLine()); Console.Write("Enter second number: ");
class Choose{ protected int x, y; public virtual void print() {
Console.Out.WriteLine("x = {0} and y = {1}", x, y); }}
class Subtraction : Choose{ private int result; public void
sub() { Console.Write("\n\nEnter first number: "); x =
Convert.ToInt32(Console.ReadLine()); Console.Write("Enter second
number: "); y = Convert.ToInt32(Console.ReadLine()); result = x -
y; } public override void print() { Console.Out.WriteLine("\n{0} -
{1} = {2}", x, y, result); }}class Addition : Choose{ private int
result; public void sum() { Console.Write("\n\nEnter first number:
"); x = Convert.ToInt32(Console.ReadLine()); Console.Write("Enter
second number: "); y = Convert.ToInt32(Console.ReadLine()); result
= x + y; } public override void print() {
Console.Out.WriteLine("\n{0} + {1} = {2}", x, y, result); }}
class Division : Choose{ private int result; public void div() {
Console.Write("\n\nEnter first number: "); x =
Convert.ToInt32(Console.ReadLine()); Console.Write("Enter second
number: "); y = Convert.ToInt32(Console.ReadLine()); result = x /
y; } public override void print() { Console.Out.WriteLine("\n{0} /
{1} = {2}", x, y, result); }}class Multiplication : Choose{ private
int result; public void mul() { Console.Write("\n\nEnter first
number: "); x = Convert.ToInt32(Console.ReadLine());
Console.Write("Enter second number: "); y =
Convert.ToInt32(Console.ReadLine()); result = x * y; } public
override void print() { Console.Out.WriteLine("\n{0} * {1} = {2}",
x, y, result); }}class Program{ static void Main(string[] args) {
int opt; Addition sumobj = new Addition(); Subtraction subobj = new
Subtraction(); Multiplication mulobj = new Multiplication();
Division divobj = new Division(); while (true) {
Console.WriteLine("Hello Dr.Adel this program for addition,
subtraction, multipliction and division");
Console.WriteLine("\t\t\t\t Made By Saeed");
Console.WriteLine("-------------- Menu ----------------");
Console.WriteLine("Choose 1 for addition ( + )");
Console.WriteLine("Choose 2 for subtraction ( - )");
Console.WriteLine("Choose 3 for multiplication ( * )");
Console.WriteLine("Choose 4 for Division ( / )");
Console.WriteLine("Choose 5 for try again");
Console.WriteLine("Choose 6 for Exit");
Console.WriteLine("^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^");
Console.WriteLine("^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^");
Console.Write("Choose Your Process: "); opt =
Convert.ToInt32(Console.ReadLine()); if (opt == 1) { sumobj.sum();
sumobj.print(); } else if (opt == 2) { subobj.sub();
subobj.print(); } else if (opt == 3) { mulobj.mul();
mulobj.print(); } else if (opt == 4) { divobj.div();
divobj.print(); } else if (opt == 5) Console.Out.WriteLine("Sorry
try again (-__-)"); else if (opt == 6) {
Console.Out.WriteLine("This is the END (^-^)"); break; } }
Console.ReadKey(); }}
