This example is for Processing 3+. If you have a previous version, use the examples included with your software. If you see any errors or have suggestions, please let us know.

Integers Floats.

Integers and floats are two different kinds of numerical data. An integer (more commonly called an int) is a number without a decimal point. A float is a floating-point number, which means it is a number that has a decimal place. Floats are used when more precision is needed.

 
int a = 0;      // Create a variable "a" of the datatype "int"
float b = 0.0;  // Create a variable "b" of the datatype "float"

void setup() {
  size(640, 360);
  stroke(255);
}

void draw() {
  background(0);
  
  a = a + 1;
  b = b + 0.2; 
  line(a, 0, a, height/2);
  line(b, height/2, b, height);
  
  if(a > width) {
    a = 0;
  }
  if(b > width) {
    b = 0;
  }
}