C# Online Compiler | .NET Fiddle

<no name> by Anonymous

using System;
					
public class Program
{
	public static void Main()
	{
		Console.WriteLine("CALCULATOR MENU");
            Console.WriteLine("1) Add two numbers.");
            Console.WriteLine("2) Subtract one number from another.");
            Console.WriteLine("3) Multiply two numbers.");
            Console.WriteLine("4) Divide one number by another.");
            Console.WriteLine("5) Calculate the remainder from dividing one number by another.");
            Console.Write("Please make your selection:");
            string myStringVar = Console.ReadLine();

            float testFloat;
            if (!float.TryParse(myStringVar, out testFloat))
            {
                Console.WriteLine("Invalid number format");
                Console.WriteLine("Please restart the application");
            } else
            { 
                if (myStringVar == "1")
                {
                    Console.WriteLine("Where Sum = OperandA + OperandB:");
                    Console.Write("Please enter OperandA: ");
                    string operandA = Console.ReadLine();
                    float valueA;
                    if (float.TryParse(operandA, out valueA))
                    {
                        Console.Write("Please enter OperandB: ");
                        string operandB = Console.ReadLine();
                        float valueB;
                        if (float.TryParse(operandB, out valueB))
                        {
                            float sumTotal = valueA + valueB;
                            Console.WriteLine("Sum = " + sumTotal);
                            Console.WriteLine("The operation has successfully completed.");
                            Console.WriteLine("Please press'Enter' to stop the program.");
                        }
                        else
                        {
                            Console.WriteLine("Invalid entry");
                            Console.WriteLine("Please restart the application");
                        }
                    }
                    else
                    {
                        Console.WriteLine("Invalid entry");
                        Console.WriteLine("Please restart the application");
                    }
                }
                if (myStringVar == "2")
                {
                    Console.WriteLine("Where Difference = OperandA - OperandB:");
                    Console.Write("Please enter OperandA: ");
                    string operandA = Console.ReadLine();
                    float valueA;
                    if (float.TryParse(operandA, out valueA))
                    {
                        Console.Write("Please enter OperandB: ");
                        string operandB = Console.ReadLine();
                        float valueB;
                        if (float.TryParse(operandB, out valueB))
                        {
                            float differenceTotal = valueA - valueB;
                            Console.WriteLine("Difference = " + differenceTotal);
                            Console.WriteLine("The operation has successfully completed.");
                            Console.WriteLine("Please press'Enter' to stop the program.");
                        }
                        else
                        {
                            Console.WriteLine("Invalid entry");
                            Console.WriteLine("Please restart the application");
                        }
                    }
                    else
                    {
                        Console.WriteLine("Invalid entry");
                        Console.WriteLine("Please restart the application");
                    }
                }
                if (myStringVar == "3")
                {
                    Console.WriteLine("Where Product = OperandA * OperandB:");
                    Console.Write("Please enter OperandA: ");
                    string operandA = Console.ReadLine();
                    float valueA;
                    if (float.TryParse(operandA, out valueA))
                    {
                        Console.Write("Please enter OperandB: ");
                        string operandB = Console.ReadLine();
                        float valueB;
                        if (float.TryParse(operandB, out valueB))
                        {
                            float productTotal = valueA * valueB;
                            Console.WriteLine("Difference = " + productTotal);
                            // Duplicate B
                            Console.WriteLine("The operation has successfully completed.");
                            Console.WriteLine("Please press'Enter' to stop the program.");
                        }
                        else
                        {
                            Console.WriteLine("Invalid entry");
                            Console.WriteLine("Please restart the application");
                        }
                    }
                    else
                    {
                        Console.WriteLine("Invalid entry");
                        Console.WriteLine("Please restart the application");
                    }
                }
                if (myStringVar == "4")
                {
                    Console.WriteLine("Where Quotient = OperandA / OperandB:");
                    Console.Write("Please enter OperandA: ");
                    string operandA = Console.ReadLine();
                    float valueA;
                    if (float.TryParse(operandA, out valueA))
                    {
                        Console.Write("Please enter OperandB: ");

                        // These 3 lines are being duplicated.
                        string operandB = Console.ReadLine();
                        float valueB;
                        if (float.TryParse(operandB, out valueB))
                        {
                            float productTotal = valueA / valueB;
                            Console.WriteLine("Difference = " + productTotal);
                            // Duplicate B
                            Console.WriteLine("The operation has successfully completed.");
                            Console.WriteLine("Please press'Enter' to stop the program.");
                        }
                        else
                        {
                            // Duplicate A
                            Console.WriteLine("Invalid entry");
                            Console.WriteLine("Please restart the application");
                        }
                    }
                    else
                    {
                        // Duplicate A
                        Console.WriteLine("Invalid entry");
                        Console.WriteLine("Please restart the application");
                    }
                }
                if (myStringVar == "5")
                {
                    Console.WriteLine("Where Modulus = OperandA % OperandB:");
                    Console.Write("Please enter OperandA: ");
                    string operandA = Console.ReadLine();
                    float valueA;
                    if (float.TryParse(operandA, out valueA))
                    {
                        Console.Write("Please enter OperandB: ");
                        string operandB = Console.ReadLine();
                        float valueB;
                        if (float.TryParse(operandB, out valueB))
                        {
                            float productTotal = valueA % valueB;
                            Console.WriteLine("Difference = " + productTotal);
                            Console.WriteLine("The operation has successfully completed.");
                            Console.WriteLine("Please press'Enter' to stop the program.");
                        }
                        else
                        {
                            // Duplicate A
                            Console.WriteLine("Invalid entry");
                            Console.WriteLine("Please restart the application");
                        }
                    }
                    else
                    {
                        Console.WriteLine("Invalid entry");
                        Console.WriteLine("Please restart the application");
                    }
                }
                if (!(myStringVar == "1" || myStringVar == "2" || myStringVar == "3" || myStringVar == "4" || myStringVar == "5"))
                {
                    Console.WriteLine("Invalid entry");
                    Console.WriteLine("Please restart the application");
                }
            }
            Console.ReadLine();
	}
}

​x
 
using System;
                    
public class Program
{
    public static void Main()
    {
        Console.WriteLine("CALCULATOR MENU");
            Console.WriteLine("1) Add two numbers.");
            Console.WriteLine("2) Subtract one number from another.");
            Console.WriteLine("3) Multiply two numbers.");
            Console.WriteLine("4) Divide one number by another.");
            Console.WriteLine("5) Calculate the remainder from dividing one number by another.");
            Console.Write("Please make your selection:");
            string myStringVar = Console.ReadLine();
​
            float testFloat;
            if (!float.TryParse(myStringVar, out testFloat))
            {
                Console.WriteLine("Invalid number format");
                Console.WriteLine("Please restart the application");
            } else
            { 
                if (myStringVar == "1")
                {
                    Console.WriteLine("Where Sum = OperandA + OperandB:");
                    Console.Write("Please enter OperandA: ");
                    string operandA = Console.ReadLine();
                    float valueA;
                    if (float.TryParse(operandA, out valueA))
                    {
                        Console.Write("Please enter OperandB: ");
                        string operandB = Console.ReadLine();
                        float valueB;
                        if (float.TryParse(operandB, out valueB))
                        {
                            float sumTotal = valueA + valueB;
                            Console.WriteLine("Sum = " + sumTotal);
                            Console.WriteLine("The operation has successfully completed.");
                            Console.WriteLine("Please press'Enter' to stop the program.");
                        }
                        else
                        {
                            Console.WriteLine("Invalid entry");
                            Console.WriteLine("Please restart the application");
                        }
                    }
                    else
                    {
                        Console.WriteLine("Invalid entry");
                        Console.WriteLine("Please restart the application");
                    }
                }
                if (myStringVar == "2")
                {
                    Console.WriteLine("Where Difference = OperandA - OperandB:");
                    Console.Write("Please enter OperandA: ");
                    string operandA = Console.ReadLine();
                    float valueA;
                    if (float.TryParse(operandA, out valueA))
                    {
                        Console.Write("Please enter OperandB: ");
                        string operandB = Console.ReadLine();
                        float valueB;
                        if (float.TryParse(operandB, out valueB))
                        {
                            float differenceTotal = valueA - valueB;
                            Console.WriteLine("Difference = " + differenceTotal);
                            Console.WriteLine("The operation has successfully completed.");
                            Console.WriteLine("Please press'Enter' to stop the program.");
                        }
                        else
                        {
                            Console.WriteLine("Invalid entry");
                            Console.WriteLine("Please restart the application");
                        }
                    }
                    else
                    {
                        Console.WriteLine("Invalid entry");
                        Console.WriteLine("Please restart the application");
                    }
                }
                if (myStringVar == "3")
                {
                    Console.WriteLine("Where Product = OperandA * OperandB:");
                    Console.Write("Please enter OperandA: ");
                    string operandA = Console.ReadLine();
                    float valueA;
                    if (float.TryParse(operandA, out valueA))
                    {
                        Console.Write("Please enter OperandB: ");
                        string operandB = Console.ReadLine();
                        float valueB;
                        if (float.TryParse(operandB, out valueB))
                        {
                            float productTotal = valueA * valueB;
                            Console.WriteLine("Difference = " + productTotal);
                            // Duplicate B
                            Console.WriteLine("The operation has successfully completed.");
                            Console.WriteLine("Please press'Enter' to stop the program.");
                        }
                        else
                        {
                            Console.WriteLine("Invalid entry");
                            Console.WriteLine("Please restart the application");
                        }
                    }
                    else
                    {
                        Console.WriteLine("Invalid entry");
                        Console.WriteLine("Please restart the application");
                    }
                }
                if (myStringVar == "4")
                {
                    Console.WriteLine("Where Quotient = OperandA / OperandB:");
                    Console.Write("Please enter OperandA: ");
                    string operandA = Console.ReadLine();
                    float valueA;
                    if (float.TryParse(operandA, out valueA))
                    {
                        Console.Write("Please enter OperandB: ");
​
                        // These 3 lines are being duplicated.
                        string operandB = Console.ReadLine();
                        float valueB;
                        if (float.TryParse(operandB, out valueB))
                        {
                            float productTotal = valueA / valueB;
                            Console.WriteLine("Difference = " + productTotal);
                            // Duplicate B
                            Console.WriteLine("The operation has successfully completed.");
                            Console.WriteLine("Please press'Enter' to stop the program.");
                        }
                        else
                        {
                            // Duplicate A
                            Console.WriteLine("Invalid entry");
                            Console.WriteLine("Please restart the application");
                        }
                    }
                    else
                    {
                        // Duplicate A
                        Console.WriteLine("Invalid entry");
                        Console.WriteLine("Please restart the application");
                    }
                }
                if (myStringVar == "5")
                {
                    Console.WriteLine("Where Modulus = OperandA % OperandB:");
                    Console.Write("Please enter OperandA: ");
                    string operandA = Console.ReadLine();
                    float valueA;
                    if (float.TryParse(operandA, out valueA))
                    {
                        Console.Write("Please enter OperandB: ");
                        string operandB = Console.ReadLine();
                        float valueB;
                        if (float.TryParse(operandB, out valueB))
                        {
                            float productTotal = valueA % valueB;
                            Console.WriteLine("Difference = " + productTotal);
                            Console.WriteLine("The operation has successfully completed.");
                            Console.WriteLine("Please press'Enter' to stop the program.");
                        }
                        else
                        {
                            // Duplicate A
                            Console.WriteLine("Invalid entry");
                            Console.WriteLine("Please restart the application");
                        }
                    }
                    else
                    {
                        Console.WriteLine("Invalid entry");
                        Console.WriteLine("Please restart the application");
                    }
                }
                if (!(myStringVar == "1" || myStringVar == "2" || myStringVar == "3" || myStringVar == "4" || myStringVar == "5"))
                {
                    Console.WriteLine("Invalid entry");
                    Console.WriteLine("Please restart the application");
                }
            }
            Console.ReadLine();
    }
}

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