# Making decisions

Using the if and if...else statements

if(score = 10)
{
  System.out.println("Game Over! you lose, loser!");
}
else
  {
    System.out.println("let the game continue");
  }

Operators

1 And >> (&&)
2 Or >> (||) 3 Not >> (!)

Using switch

Instead of have multiple nested if statements a switch statement is can be user as it make checking evaluating something across multiple possible outcomes much easier

if(year == 1)
{
  System.out.println("this is not my year");
}
else
  {
    if(year == 2)
    {
      System.out.println("maybe it might  be my year");
    }
    else 
      {
        System.out.println("i will take what i can get");
      }

switch(year)
{
  case 1:
      System.out.println("this is not my year");
      break;
  case 2:
      System.out.println("maybe it might be my year ");
      break;
  case 3:
      System.out.println("i will take what i can get");
      break;
  default:
      System.out.println("What is thia?");
}

Using case expression

Switch(departmentCode)
{
  case 'a','A' -> departmentName = "Accounting";
  case 'm', "M" -> departmentName = "Marketing";
}

Exercises

EvenOdd

1 In a file called EvenOdd.java create an application that asks the user to enter an integer. Pass the integer to method that determines weather the number is even or and returns a boolean value. Display weather the number is even or odd.

AscendingAndDescending

1 In a file called AscendingAndDescending.java create an application that prompts the user for 5 integers and displays the in ascending and descending order.

ShadyRestRoom

1 In a file called ShadyRestRoom.java create an application that determines the price for of a room. Ask the user to choose 1 for a queen bed, 2 for a king bed or 3 for a king and pullout couch. The output must reflect the input and the price of the room: R500 for queen, R700 for king and R900 for king and pullout couch. If the user inputs and invalid choice display a corresponding message and set the price to R0.

ShadyRestRoom2

1 In a file called ShadyRestRoom2.java now ask the user to specify a 1 for a lake view or 2 a park view, but only ask them if the bed size entry is valid. Add R100 to the price of any room with a lake view. If the input value fo view is invalid display a corresponding message and set the price of the room as lake view.

CellPhoneService

1 In a file called CellPhoneService.java create an application that prompt the user for max monthly amount they need for talking minutes, text messages needed and gigabytes fo data needed. display a recommendation of the best plan for the users needs. A user who needs less than 500 minutes, and no text or data should buy Plan A at R150 per month. A user who needs less than 500 minutes and any text messages should buy Plan B at R210 per month. A user who needs 500 or more minutes and no data should buy either Plan C for up to 100 text messages at R90 per month or plan D for 100 text messages or more at R115 per month. A use who need any data should buy Plan E for up to 3 gigabytes at R 150 per month or Plan F for 3 gigabytes or more at R230 per month