How can remove the word "null" in the output FIRSTNAME: NULL?-CodePudding

        string FirstName, LastName = " ";
        char MiddleInitial = ' ';

        Console.Write("Insert  first name: ");
        FirstName = Console.ReadLine();

        if (FirstName.Equals("null"))
        {
            Console.Write("Insert middle initial ");
            Console.Write("\nInsert last name \n");
        }
        else
        {
            Console.Write("Insert middle initial: ");
            MiddleInitial = Console.ReadLine()[0];
            Console.Write("Insert  last name: ");
            LastName = Console.ReadLine();
        }

        string Month, Year, Day;
        Console.Write("\nInsert birth month: ");
        Month = Console.ReadLine();

        if (Month.Equals("null"))
        {
            Console.Write("Insert birth day ");
            Console.Write("\nInsert birth year \n");

            Console.WriteLine("\nYour record");
            Console.WriteLine("FIRST NAME:{0}", FirstName);
            Console.WriteLine("MIDDLE INITIAL: {0}", MiddleInitial);
            Console.WriteLine("LASTNAME: {0}", LastName);
            Console.WriteLine("BIRTH MONTH:");
            Console.WriteLine("BIRTH DAY:");
            Console.WriteLine("BIRTH Year:");
            Console.WriteLine("BIRTHDAY:");
          
            Console.ReadKey();
        }
        else
        {
            Console.Write("Insert birth day: ");
            Day = Console.ReadLine();
            Console.Write("Insert birth year: ");
            Year = Console.ReadLine();

            Console.WriteLine("\nYour record");
            Console.WriteLine("FIRST NAME:{0}", FirstName);
            Console.WriteLine("MIDDLE INITIAL: {0}", MiddleInitial);
            Console.WriteLine("LASTNAME: {0}", LastName);
            Console.WriteLine("BIRTH MONTH: {0}", Month);
            Console.WriteLine("BIRTH DAY: {0}", Day);
            Console.WriteLine("BIRTH YEAR: {0}", Year);
            Console.WriteLine("BIRTHDAY:{0}/{1}/{2}", Month, Day, Year);

            Console.ReadKey();
        }

The program runs correctly the only matter is how can I make the program output to be like this:

Insert  first name: null
Insert middle initial
Insert last name

Insert birth month: null
Insert birth day
Insert birth year

Your record
FIRST NAME:
MIDDLE INITIAL:
LASTNAME:
BIRTH MONTH:
BIRTH DAY:
BIRTH Year:
BIRTHDAY:

But what the program currently outputs is this:

Insert  first name: null
Insert middle initial
Insert last name

Insert birth month: null
Insert birth day
Insert birth year

Your record
FIRST NAME:null
MIDDLE INITIAL:
LASTNAME:
BIRTH MONTH:
BIRTH DAY:
BIRTH Year:
BIRTHDAY:

As you can see it display

FIRST NAME:null    // It should be empty

The program should display nothing if I insert two "null" words without sacrificing others function.

But if I insert one null and then I insert the value of the others should display like this

Insert  first name:James
Insert middle initial:F
Insert last name:Capili

Insert birth month:null
Insert birth day
Insert birth year

Your record
FIRST NAME:James
MIDDLE INITIAL:F
LASTNAME:Capili
BIRTH MONTH:
BIRTH DAY:
BIRTH Year:
BIRTHDAY:

Insert  first name: null
Insert middle initial
Insert last name

Insert birth month: 04
Insert birth day:14
Insert birth year:2000

Your record
FIRST NAME:
MIDDLE INITIAL:
LASTNAME:
BIRTH MONTH:04
BIRTH DAY:14
BIRTH Year:2000
BIRTHDAY:04/14/2000

I've been thinking this like for 4 hours trying to figure out what best logic I should do. I hope someone can help me.

CodePudding user response：

Handle the null value through FirstName == "null" ? "" : FirstName

  using System;

  class Program
  {
  public static void data()
  {
      string FirstName, LastName = " ";
      char MiddleInitial = ' ';

  Console.Write("Insert  first name: ");
  FirstName = Console.ReadLine();

  if (FirstName.Equals("null"))
  {
      Console.Write("Insert middle initial ");
      Console.Write("\nInsert last name \n");

  }
  else
  {
      Console.Write("Insert middle initial: ");
      MiddleInitial = Console.ReadLine()[0];
      Console.Write("Insert  last name: ");
      LastName = Console.ReadLine();
  }
  string Month, Year, Day;
  Console.Write("\nInsert birth month: ");
  Month = Console.ReadLine();

  if (Month.Equals("null"))
  {
      Console.Write("Insert birth day ");
      Console.Write("\nInsert birth year \n");

      Console.WriteLine("\nYour record");
      Console.WriteLine("FIRST NAME:{0}", FirstName == "null" ? "" : FirstName);
      Console.WriteLine("MIDDLE INITIAL: {0}", MiddleInitial);
      Console.WriteLine("LASTNAME: {0}", LastName);
      Console.WriteLine("BIRTH MONTH:");
      Console.WriteLine("BIRTH DAY:");
      Console.WriteLine("BIRTH Year:");
      Console.WriteLine("BIRTHDAY:");


      Console.ReadKey();
  }
  else
  {
      Console.Write("Insert birth day: ");
      Day = Console.ReadLine();
      Console.Write("Insert birth year: ");
      Year = Console.ReadLine();

      Console.WriteLine("\nYour record");
      Console.WriteLine("FIRST NAME:{0}",  FirstName == "null" ? "" : FirstName);
      Console.WriteLine("MIDDLE INITIAL: {0}", MiddleInitial);
      Console.WriteLine("LASTNAME: {0}", LastName);
      Console.WriteLine("BIRTH MONTH: {0}", Month);
      Console.WriteLine("BIRTH DAY: {0}", Day);
      Console.WriteLine("BIRTH YEAR: {0}", Year);
      Console.WriteLine("BIRTHDAY:{0}/{1}/{2}", Month, Day, Year);


      Console.ReadKey();
  }

 }
  public static void Main(string[] args)
  {
      data();
  }
 }