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Programming Language Features

Programming Language Features. Syntax Semantics. Syntax Diagram. Syntax Diagram. Syntax Diagram. Syntax Diagram. Syntax Diagram. Syntax Diagram. Syntax Diagram. Syntax Diagram. Syntax Diagram. Drawing Gizmo Example. // Example program with parameters that displays a T

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Programming Language Features

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  1. Programming Language Features • Syntax • Semantics

  2. Syntax Diagram

  3. Syntax Diagram

  4. Syntax Diagram

  5. Syntax Diagram

  6. Syntax Diagram

  7. Syntax Diagram

  8. Syntax Diagram

  9. Syntax Diagram

  10. Syntax Diagram

  11. Drawing Gizmo Example // Example program with parameters that displays a T // The T is drawn by the method drawT public class Driver { private DrawingGizmo pencil; public void drawT() { //Draws a letter T //PRE: Assumes the current position of the pen is the // leftmost postion of the top of the T and the direction // of the pen is 0 degrees //POST: The method leaves the pen at the rightmost // position of the top of the T and the direction of the // pen is 0 degrees pencil.draw(); pencil.turnBy(90); pencil.moveBy(80);

  12. Drawing Gizmo Example //Move the pen to the middle of the top of the T pencil.dontDraw(); pencil.turnBy(-180); pencil.moveBy(40); //Draw the vertical part of the T pencil.draw(); pencil.turnBy(-90); pencil.moveBy(120); //Move pen to the rightmost position of the top of the T //leave the direction of the pen at 0 degrees pencil.dontDraw(); pencil.turnBy(180); pencil.moveBy(120); pencil.turnBy(90); pencil.moveBy(40); pencil.turnBy(-90); }

  13. Drawing Gizmo Example public Driver() { pencil = new DrawingGizmo(); //Move the pen to the left pencil.dontDraw(); pencil.turnBy(-90); pencil.moveBy(80); pencil.turnBy(90); drawT(); } }

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