Control structures

Structured programming builds every program from three control structures: sequence, selection and iteration. Grade 11 combines and nests them for real problems.

• Sequence: statements run top to bottom in order.
• Selection: `if/else`, nested `if`, and `case` choose between paths.
• Iteration: `for`, `while` and `repeat` repeat blocks.
• Nesting a loop inside a decision (or a decision inside a loop) handles most CAPS problems — keep indentation clean so the structure is visible.

• Control structure — sequence, selection or iteration; the building blocks of logic.
• Nesting — placing one control structure inside another.