5. Conditional Statements

• An if statement is used to execute code when a condition or conditions are true. This creates branches in the code where different sections are executed under different conditions.
• Print message when a value is more than 6

  if(value > 6){

    println("Hi");

  }
• Add 2 to a variable when a value equals 800

  if(value == 800){

    variable += 2;

  }
• Multiply a value by -1 when a value equals 0 or 500

  if(value == 0 || value == 500){

    value *= -1;

  }
• Print a message when one value is ‘y’ and another is less than 25

  if(value1 == y && value2 < 25){

    println("hello");

  }
• Display a different message if a value is over 400, between 300 and 400, between 100 and 300, or less than 100

  if(value > 400){

    println("your value is over 400");

  }

  else if(value >= 300 && value <400){

    println("your value is between 300 and 400");

  }

  else if(value >= 100 && value <300){

    println("your value is between 100 and 300");

  }

  else{

    println("your value is less than 100");

  }
• Write a procedure using if statements that will animate a square moving from the top of the screen to the bottom. When the square reaches the edge of the screen, it should reverse directions.

  void setup(){

    size(800,500);

  }

  int y = 10;

  int dir = 1;

  void animate(){

  fill(0);

  square(350,y,100);

  if(y == 400 || y == 0){

    dir = dir * -1;

  }

  y = y + dir;

  }

  void draw(){

    background(255);

    animate();

  }
• A while loop repeats code until a condition becomes false. In comparison with a for loop, a while loop runs an arbitrary number of times, while a for loop runs for a fixed number of times. For this reason, code in the body of the loop must modify the condition variable(s), otherwise the loop will run forever.
• Runs as long as a value equals 4

  while(value == 4){
• Stops when a value equals “quit”

  while(!value.equals (“quit”)){
• Runs while a value is more than 100 and a value is y

  while(value1 > 100 && value2 == ‘y’){