Lab 1: Hello World

Vocabulary

Statement
- A single executable action of a program. In Java, there is usually only one statement per line and they always end in a semicolon. (;)
Program
- A sequence of code statements executed in order, starting the main method.
Variable
- A symbol that represents a value of a defined type.
- Types include:
  - int: used for whole numbers (0, 1, 2, 3, etc)
  - double: used for decimal values (1.5, 2.0, etc)
  - boolean: true or false
  - String: represents a sequence of characters. Always in quotes. (“HelloWorld”)
- Variables are declared and given values as follows. The name of a variable does not affect how a program runs.:
```
 int x = 1675;
 double y = 16.75;
 boolean z = true;
 String a = "frc1675-UPS";
```
System Library
- Java provides a library of standard functions available for all developers
- This is done to speed up development by providing standard and stable solutions to common programming problems
- One common programming actions is to print to the screen
  - This can be done via the following line: System.out.println(x);
Comment
- Special characters used to disable a line of code. In Java, use “//” at the beginning of a line to comment it.

Setup

Create a folder called “HelloWorld” in C:\dev. (use Windows Explorer)
From the desktop, open Visual Studio code for robot development.
Select “File” » “Open Folder…” and then choose C:\dev\HelloWorld.
Create a new file called Main.java.

Copy the contents below into the new file.

class Main {
  public static void main(String[] args) {
      System.out.println("Hello World!"); // Display the string.
  }
}

Press the Run button just above the main method.
Confirm “HelloWorld” is printed in the console output.

Exercise #1

Modify the HelloWorld program to have one variable of each type mentioned above in Vocabulary.
Print the value of each variable out to the console window.
Reorder your print statements and note the effect. How does it relate to the definition of a program above?
Comment out two of your print statements and rerun your program. What did you observe?

Exercise #2

Comment out all of your previous code from Exercise #1
Write a program that will print the following face using various strings.
View here in a new tab for better formatting

                   __ooooooooo__
              oOOOOOOOOOOOOOOOOOOOOOo
          oOOOOOOOOOOOOOOOOOOOOOOOOOOOOOo
       oOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOo
     oOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOo
   oOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOo
  oOOOOOOOOOOO*  *OOOOOOOOOOOOOO*  *OOOOOOOOOOOOo
 oOOOOOOOOOOO      OOOOOOOOOOOO      OOOOOOOOOOOOo
 oOOOOOOOOOOOOo  oOOOOOOOOOOOOOOo  oOOOOOOOOOOOOOo
oOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOo
oOOOO     OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO     OOOOo
oOOOOOO OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO OOOOOOo
 *OOOOO  OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO  OOOOO*
 *OOOOOO  *OOOOOOOOOOOOOOOOOOOOOOOOOOOOO*  OOOOOO*
  *OOOOOO  *OOOOOOOOOOOOOOOOOOOOOOOOOOO*  OOOOOO*
   *OOOOOOo  *OOOOOOOOOOOOOOOOOOOOOOO*  oOOOOOO*
     *OOOOOOOo  *OOOOOOOOOOOOOOOOO*  oOOOOOOO*
       *OOOOOOOOo  *OOOOOOOOOOO*  oOOOOOOOO*      
          *OOOOOOOOo           oOOOOOOOO*      
              *OOOOOOOOOOOOOOOOOOOOO*          
                   ""ooooooooo""

If you want, come up with your own ASCII artistic design to print out!