/************************************************************************************************
* Program name : Basic arithmetic operations *
* Program ver. : 2.0 *
* Created by : SharpDevelop *
* Code author : Perić Željko *
* Code language : C# *
* Date created : 27.01.2012 *
* Time created : 18:41 *
* *
* *
* Program Description : Simple console application to calculate four simple math operations *
* Addition, subtraction, multiplication and division. *
* *
* *
* Program Accuracy Notice : *
* *
* All calculations in program are executed using double type of variable. *
* By default , a double value contains 15 decimal digits of precision , *
* although a maximum of 17 digits is maintained internally. *
* Result is shown in scientific format , rounded at fourteen decimals. *
* This could cause fatal error because , in some cases for accurate result , *
* many more digits are significant , especially when very large or very small *
* numbers are involved. *
* Usually input values that user type in , have it's own precision error... *
* *
* So the result that this program gives is not always 100 % accurate, but approximate. *
* *
* *
* All the best, *
* Author. *
************************************************************************************************/
using System;
namespace Basic_arithmetic_operations
{
class Program
{
public static void Main(string[] args)
{
//
// declaration of variables
//
string A = " ";
string B = " ";
string Answer = "N";
double X = 0;
double Y = 0;
double Z = 0;
bool Number_Relevance = false;
//
// beginning label ,
// marks the point of return in program
// if the user wants to re-start program
// used for 'goto' command
//
beginning :
//
// Set console dimensions , text color , clear console and write Title
//
Console.SetWindowSize(63,33);
Console.Title = "Basic arithmetic operations";
Console.ForegroundColor = ConsoleColor.Green;
Console.Clear();
Console.WriteLine("***************************************************************");
Console.WriteLine(" Program basic arithmetic operations");
Console.WriteLine("***************************************************************");
//
// Get X value from Console
//
A = " ";
Number_Relevance = false;
Console.WriteLine();
Console.WriteLine("Enter value for X : ");
A = Console.ReadLine();
Number_Relevance = double.TryParse(A,out X);
//
// Check whether the entered number belongs to the set of real numbers
// If not re-request the value of X
//
while (Number_Relevance == false)
{
A = " ";
Number_Relevance = false;
Console.WriteLine("Error , You must enter a number. Please enter value for X : ");
A = Console.ReadLine();
Number_Relevance = double.TryParse(A,out X);
}
//
// Get Y value from Console
//
B = " ";
Number_Relevance = false;
Console.WriteLine();
Console.WriteLine("Enter value for Y: ");
B = Console.ReadLine();
Number_Relevance = double.TryParse(B,out Y);
//
// Check whether the entered number belongs to the set of real numbers
// If not re-request the value of Y
//
while (Number_Relevance == false)
{
B = " ";
Number_Relevance = false;
Console.WriteLine("Error , You must enter a number. Please enter value for Y : ");
B = Console.ReadLine();
Number_Relevance = double.TryParse(B,out Y);
}
//
// Clear console for result output and write Title
//
Console.Clear();
Console.WriteLine("***************************************************************");
Console.WriteLine(" Program basic arithmetic operations");
Console.WriteLine("***************************************************************");
Console.WriteLine();
Console.WriteLine(" X = " + X.ToString() + " Y = " + Y.ToString());
//
// Basic arithmetic operations + , - , * , /
// Calculate and write the result
//
//
// Z = X + Y
//
Z = X + Y;
Console.WriteLine();
Console.WriteLine("***************************************************************");
Console.WriteLine();
Console.WriteLine(" Z = X + Y" + " Z = " + X.ToString() + " + " + Y.ToString() + " Z = " + Z.ToString());
Console.WriteLine();
//
// Z = X - Y
//
Z = X - Y;
Console.WriteLine();
Console.WriteLine("***************************************************************");
Console.WriteLine();
Console.WriteLine(" Z = X - Y" + " Z = " + X.ToString() + " - " + Y.ToString() + " Z = " + Z.ToString());
Console.WriteLine();
//
// Z = X * Y
//
Z = X * Y;
Console.WriteLine();
Console.WriteLine("***************************************************************");
Console.WriteLine();
Console.WriteLine(" Z = X * Y" + " Z = " + X.ToString() + " * " + Y.ToString() + " Z = " + Z.ToString());
//
// Z = X / Y
//
// If Y equals zero , dividing by zero is not possible.
// You may try to skip this question , the result is interesting
// from math aspect , if you have adequate scool you should anderstand.
if ( Y != 0 )
{
Z = X / Y;
Console.WriteLine();
Console.WriteLine("***************************************************************");
Console.WriteLine();
Console.WriteLine(" Z = X / Y" + " Z = " + X.ToString() + " / " + Y.ToString() + " Z = " + Z.ToString());
Console.WriteLine();
Console.WriteLine("***************************************************************");
Console.WriteLine();
}
else
{
Console.WriteLine();
Console.WriteLine("***************************************************************");
Console.WriteLine();
Console.WriteLine(" Z = X / Y" + " Z = ?" + " Dividing by zero is not possible ");
Console.WriteLine();
Console.WriteLine("***************************************************************");
Console.WriteLine();
}
//
// The request for an answer , if user wants to start program again.
//
Answer = " ";
Console.WriteLine("Do you want to start the program again <Y/N>");
Answer = Console.ReadLine(); // get the ansver
Answer = Answer.ToUpper(); // set all the letters inside ansver to Upper case
while(Answer != "Y" && Answer != "N")
{
Answer = " ";
Console.WriteLine("Error, answer could only be Y for Yes or N for No !");
Console.WriteLine("Do you want to start the program again <Y/N>");
Answer = Console.ReadLine();
Answer = Answer.ToUpper();
}
if (Answer == "Y")
{
//
// jump to beginning label
//
goto beginning;
}
Console.WriteLine();
Console.Write("Press any key to continue . . . ");
Console.ReadKey(true);
}
}
}
/************************************************************************
* Program Licence : *
* *
* Copyright 2012 , Perić Željko *
* (periczeljkosmederevo@yahoo.com) *
* *
* According to it's main purpose , this program is licenced *
* under the therms of 'Free Software' licence agreement. *
* *
* If You do not know what those therms applies to *
* please read explanation at the following link : *
* (http://www.gnu.org/philosophy/free-sw.html.en) *
* *
* Since it is Free Software this program has no warranty of any kind. *
************************************************************************
* Ethical Notice : *
* *
* It is not ethical to change program code signed by it's author *
* and then to redistribute it under the same name , especially *
* if it is incorrect. *
* *
* It is recommended that if you make improvement in program code , *
* to make remarks of it and then to sign it by Your's name , *
* for further redistribution as new major version of program. *
* *
* Author name and references of old program code version should be *
* kept , for tracking history of program development. *
* *
* For any further information please contact code author at his email. *
************************************************************************/
/************************************
* List Of Revisions *
************************************
* Major revision of version 1.0 *
* Author 25.11.2013 *
* New comments added *
* Program licence changed *
* New version number 2.0 *
************************************/
