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### 5.3 Iterative Statements

`while assertion block end`

  Repeats block while assertion is true.

`for i = a to b { step c } block end`

  Repeats block while incrementing number i by c (default: 1), from a to b. Numbers b and c are evaluated at each step. Iteration ends as soon as i is greater than or smaller than b, depending on the sign of c.

`for P in s block end`

  Repeats block while point P runs through set s.

Example:

    O = point(3,2)
    H = hexagon(O, 3, 0°)
    draw (H)

    for P in H
      draw O.P dotted
    end