Using arrays inside for loops

Processing Coding Questions
5

@Focksbot:

To stay organized, first declare globals and optionally assign values at the same time (on the same line).

So you cannot do this:

int x;
x = 2; // illegal
void setup(){
  print(x);
}

…but you can assign globally at declaration, or declare, then assign later:

int x = 2;
int y;
void setup(){
  y = 4;
  print(x, y);
}

Arrays work the same way. That means you can do any of these things:

int a[] = new int[2];  // size now, values later
int b[];               // size later
int c[] = { 10, 20 };  // values now, sets the size
int d[] = { 30, 40 };
int e[] = { 40, 50 };
void setup(){
  a[0] = 10;
  a[1] = 20;
  b = new int[2];  // must size first!
  b[0] = 100;
  b[1] = 200;
  c[0] = 999;      // change a value
  d = new int[4];  // replace with new size (empty)
  e = new int[]{ 0, 1, 2, 3};  // replace with new values, different size
}