Lesson-02

Control Statements - Selection

WriteLine Substitution Parameters

• When you call WriteLine to print a value, you can use substitution parameters. These are numbers, starting with 0 and counting up, enclosed in braces {}. You place the value to substitute for the parameter after the close quote, separated by commas.

• You can have more than one substitution parameter, as long as you count up from zero, and you ensure that the substituted values are listed in the order they are numbered.

int intOne = 5, intTwo = 7, intThree=9;
Console.WriteLine("one: {0}, two: {1}, three: {2}, one again: {0}", intOne, intTwo, intThree);

Control Statements

The if Statement

namespace HelloWorldConsole
{
    class Program
    {
        static void Main(string[] args)
        {
         
            string userInput;
            int userAge;
            Console.Write("Please enter you Age: ");
            userInput = Console.ReadLine();
            userAge = Int32.Parse(userInput);

            #region Single Decision and Action with braces
            if (userAge > 0)
            {
                Console.WriteLine("Your age {0} is greater than zero.", userAge);
            }
            #endregion

            #region Single Decision and Action without brackets
            if (userAge < 0)
                Console.WriteLine("Your age {0} is less than zero.", userAge);
            #endregion

            #region Either/Or Decision
            if (userAge != 0)
            {
                Console.WriteLine("Your agee {0} is not equal to zero.", userAge);
            }
            else
            {
                Console.WriteLine("Your number {0} is equal to zero.", userAge);
            }
            #endregion

            #region Multiple Case Decision
            if (userAge < 0 || userAge == 0)
            {
                Console.WriteLine("This user is new born, his age {0} yaers", userAge);
            }
            else if (userAge > 0 && userAge < 10)
            {
                Console.WriteLine("This user is a chiled , his age is  {0} yaer", userAge);
            }
            else if (userAge >= 10 && userAge <= 20)
            {
                Console.WriteLine("This user is a teen age  , his age is  {0} yaer", userAge);
            }
            else
            {
                Console.WriteLine("This user is a mature  , his age is  {0} yaer", userAge);
            }
            
            #endregion
        }
    }
}

The switch Statement

namespace PatFinTyp
{
    class Program
    {
        static void Main(string[] args)
        {
            string userInput;
            int finTyp;
            Console.WriteLine("please enter number between 1 & 3");
            userInput = Console.ReadLine();
            finTyp = Int32.Parse(userInput);
  #region switch on a value
            switch (finTyp)
            {
                case 1:
                    Console.WriteLine("Patient Financial Type is Free ");
                    break;
                case 2:
                    Console.WriteLine("Patient Financial Type is Self-Pay ");
                    break;
                case 3:
                    Console.WriteLine("Patient Financial Type is Insured ");
                    break;
                default:
                    Console.WriteLine("error : please enter number between 1 & 3 ");
                    break;
            }
            #endregion
        }
    }