private static MathematicalDataContainer GetUserInput()
{
MathematicalDataContainer data = new MathematicalDataContainer();
Console.WriteLine("Enter the first number:");
Console.Write(":>");
string n1 = Console.ReadLine(); //input for the 1st number
Console.WriteLine("Choose maths operation.");
Console.Write(":>");
string operation = Console.ReadLine().ToUpper(); //input for the maths operation
Console.WriteLine("Enter the second number:");
Console.Write(":>");
string n2 = Console.ReadLine(); //input for the 2nd number
if (IsInputValid(n1) && IsInputValid(n2) && IsOperationValid(operation)) // input validation
{
data.FirstNumber = double.Parse(n1);
data.SecondNumber = double.Parse(n2);
data.MathOperation = operation;
data.CorrrectInput = true;
}
else
{
data.CorrrectInput = false;
}
return(data);
}
private static MathematicalDataContainer GetUserInputInLoop()
{
MathematicalDataContainer data = new MathematicalDataContainer();
bool end = false;
do
{
Console.Clear();
Console.WriteLine("Theoperation will be performed on the following numbers: ");
foreach (var number in data.Numbers)
{
Console.Write(number + " ");
}
Console.WriteLine("Enter the number to be used in calculations. If you want to perform the operation, type 'END'.");
Console.Write(":>");
string n = Console.ReadLine(); //input numbers
if (n == "end")
{
end = true;
}
else
{
if (IsInputValid(n)) // input validation
{
data.Numbers.Add(double.Parse(n));
}
else
{
data.CorrrectInput = false;
}
}
} while (end == false);
Console.WriteLine("Choose maths operation.");
Console.Write(":>");
string operation = Console.ReadLine().ToUpper(); //input for the maths operation
if (data.CorrrectInput && IsOperationValid(operation)) // input validation
{
data.MathOperation = operation;
data.CorrrectInput = true;
}
else
{
data.CorrrectInput = false;
}
return(data);
}
static void Main(string[] args)
{
Console.Title = "Console calculator";
Console.WriteLine("This is an arithmetic claculator for console commands");
Console.WriteLine("Type 'HELP' to get the list of commands available");
Console.WriteLine("Type 'START' to start the calculation");
Console.WriteLine("To exit at any time type 'EXIT' command");
string cmd;
do
{
Console.Write(":>");
cmd = Console.ReadLine().ToUpper(); //make input as case insensitive
switch (cmd)
{
case "HELP": //help command case here
PrintAvailableCommands();
break;
case "EXIT": //exit command case here
Environment.Exit(0);
break;
case "START": //start command case here
{
MathematicalDataContainer data = GetUserInput(); // get user input
if (data.CorrrectInput)
{
if (data.MathOperation == "ADD")
{
data.Result = Calculations.Add(data.FirstNumber, data.SecondNumber);
}
else if (data.MathOperation == "SUB")
{
data.Result = Calculations.Subtract(data.FirstNumber, data.SecondNumber);
}
else if (data.MathOperation == "MUL")
{
data.Result = Calculations.Multiply(data.FirstNumber, data.SecondNumber);
}
else if (data.MathOperation == "DIV")
{
if (data.SecondNumber == 0)
{
PrintErrorMessage("Division by zero is not allowed!!");
break;
}
else
{
data.Result = Calculations.Divide(data.FirstNumber, data.SecondNumber);
}
}
Console.WriteLine($"The result of the operation is: {data.Result}."); // print results of the calculation
}
else
{
PrintErrorMessage("Error!! Incorrect input!!"); // error message for failed input validation
}
break;
}
case "CLS": //clear screen command case
Console.Clear();
break;
default:
PrintErrorMessage("Bad command!!"); //default wrong command message
break;
}
}while (cmd.ToUpper() != "EXIT"); //run the screen till exit command typed
}