2. Variables

• What are the 5 types of data that can be a variable?

  int, float, char, String and boolean
• What type of variable data is only a whole number?

  int
• What type of variable data can be any number?

  float
• What type of variable data can be one character?

  char
• What type of variable data can be multiple characters?

  String
• The requirements of a variable identifier are: They must start with a letter, and can only contain letters, numbers, and underscores.
• What type of variable data is true or false?

  boolean
• size(400,400);

  boolean a = false;

  if (!a){

  rect(120, 80, 200, 200);

  }

  a = true;

  if (a) {

  line(80, 40, 360, 320);

  line(80, 320, 360, 40);

  }

  (This is an example of what type of variable?)

  boolean
• Write a variable identifier to hold the sum of a bunch of numbers: int sum = 0;
• Write a variable identifier which will be used to calculate the product of a set of numbers: float product = 1; or int product = 1;
• Write a variable identifier that will hold the name of a character: String name = "your_name";
• The 5 variable operators are: + - * / %
• What does % do?

  It is the modular operator, which returns the remainder of a division operation.
• The four assignment operators are: += -= *= /=
• Write a variable to store 2x + 3y − z: int result = 2 * x + 3 * y - z;
• Write a variable to store 2×3 / 4: float result = (2 * 3) / 4;
• Write a variable to store 4 % 3: int remainder = 4 % 3;
• Write a line of code that will add 7 to a variable and store the result in the same variable: int num = num + 7; or num += 7;
• Write the shortest line of code to increment a variable by 1: num++;
• Write the shortest line of code to decrement a variable by 1: num--;