static void Main(string[] args)
{
string title = @"
_________.__ .__ _________ .__ .__ __
/ _____/|__| _____ ______ | | ____ \_ ___ \_____ | | ____ __ __| | _____ _/ |_ ___________
\_____ \ | |/ \\____ \| | _/ __ \/ \ \/\__ \ | | _/ ___\| | \ | \__ \\ __\/ _ \_ __ \
/ \| | Y Y \ |_> > |_\ ___/\ \____/ __ \| |_\ \___| | / |__/ __ \| | ( <_> ) | \/
/_______ /|__|__|_| / __/|____/\___ >\______ (____ /____/\___ >____/|____(____ /__| \____/|__|
\/ \/|__| \/ \/ \/ \/ \/
";
Console.WriteLine(title);
Console.WriteLine("Welcome to simple calculator!");
double firstNumber = 0;
double secondNumber = 0;
double operationResult = 0;
string operatorSymbol = "";
bool inputValid = false;
string moreCalculations = "";
do
{
do
{
Console.Write("Provide first number: ");
string firstInput = Console.ReadLine();
if (Double.TryParse(firstInput, out firstNumber))
{
inputValid = true;
}
else
{
inputValid = false;
Console.WriteLine($"{firstInput} is not a valid number!");
}
} while (inputValid == false);
do
{
Console.Write("Provide second number: ");
string secondInput = Console.ReadLine();
if (Double.TryParse(secondInput, out secondNumber))
{
inputValid = true;
}
else
{
inputValid = false;
Console.WriteLine($"{secondInput} is not a valid number!");
}
} while (inputValid == false);
do
{
if (secondNumber == 0)
{
Console.Write("Provide one of the legal operators (+ OR - OR *): ");
}
else
{
Console.Write("Provide one of the legal operators (+ OR - OR / OR *): ");
}
string operatorInput = Console.ReadLine();
operatorSymbol = operatorInput;
if (operatorInput != "+" && operatorInput != "-" && operatorInput != "/" && operatorInput != "*")
{
inputValid = false;
Console.WriteLine($"{operatorInput} is not a valid operator!");
}
else
{
inputValid = true;
if (secondNumber == 0 && operatorInput == "/")
{
Console.WriteLine("Division by 0 is not allowed! Please provide different operator.");
inputValid = false;
}
}
} while (inputValid == false);
operationResult = Calculator.CalculateResult(firstNumber, secondNumber, operatorSymbol);
Console.WriteLine($"The result of {firstNumber} {operatorSymbol} {secondNumber} is {operationResult}");
Console.WriteLine("More calculations? (y/n): ");
moreCalculations = Console.ReadLine();
} while (moreCalculations == "y");
Console.WriteLine("Bye!");
}