Counting
You can also set a variable to a new value using itself, in a sort of feedback loop.
int a=10;
a=a+1;
println(a);
a=a+4;
println(a);
a=a * 2;
println(a);
a=a - 40;
println(a);
a=a+20;
println(a);
a=150 / a;
println(a);
a=a*a;
println(a);
So, you can use a variable to count:
int a=0;
a=a+1;
println(a);
a=a+1;
println(a);
a=a+1;
println(a);
a=a+1;
println(a);
a=a+1;
println(a);
Now see what happens when we add in Processing's draw loop:
int a=0;
void setup()
{
size(500,300);
}
void draw()
{
a=a+1;
println(a);
}