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ÿþMehran Sahami Handout #15A CS 106A October 10, 2007 Solutions for Section #2 Based on a handout by Eric Roberts 1. The Fibonacci sequence /* * File: Fibonacci.java * -------------------- * This program lists the terms in the Fibonacci sequence up to * a constant MAX_TERM_VALUE, which is the largest Fibonacci term * the program will display. */ import acm.program.*; public class Fibonacci extends ConsoleProgram { public void run() { println("This program lists the Fibonacci sequence."); int t1 = 0; int t2 = 1; while (t1 <= MAX_TERM_VALUE) { println(t1); int t3 = t1 + t2; t1 = t2; t2 = t3; } } /* Defines the largest term to be displayed */ private static final int MAX_TERM_VALUE = 10000; }  2  2. Drawing a robot face /* File: RobotFace.java */ /* This program draws a robot face. */ import acm.graphics.*; import acm.program.*; import java.awt.*; public class RobotFace extends GraphicsProgram { /* Parameters for the drawing */ private static final int HEAD_WIDTH = 100; private static final int HEAD_HEIGHT = 150; private static final int EYE_RADIUS = 10; private static final int MOUTH_WIDTH = 60; private static final int MOUTH_HEIGHT = 20; public void run() { addFace(getWidth() / 2, getHeight() / 2); } /* Adds the entire face centered at (cx, cy) */ private void addFace(double cx, double cy) { addHead(cx, cy); addEye(cx - HEAD_WIDTH / 4, cy - HEAD_HEIGHT / 4); addEye(cx + HEAD_WIDTH / 4, cy - HEAD_HEIGHT / 4); addMouth(cx, cy + HEAD_HEIGHT / 4); } /* Adds the head centered at (cx, cy) */ private void addHead(double cx, double cy) { double x = cx - HEAD_WIDTH / 2; double y = cy - HEAD_HEIGHT / 2; GRect head = new GRect(x, y, HEAD_WIDTH, HEAD_HEIGHT); head.setFilled(true); head.setFillColor(Color.GRAY); add(head); } /* Adds an eye centered at (cx, cy) */ private void addEye(double cx, double cy) { double x = cx - EYE_RADIUS; double y = cy - EYE_RADIUS; GOval eye = new GOval(x, y, 2 * EYE_RADIUS, 2 * EYE_RADIUS); eye.setFilled(true); eye.setColor(Color.YELLOW); add(eye); } /* Adds a mouth centered at (cx, cy) */ private void addMouth(double cx, double cy) { double x = cx - MOUTH_WIDTH / 2; double y = cy - MOUTH_HEIGHT / 2; GRect mouth = new GRect(x, y, MOUTH_WIDTH, MOUTH_HEIGHT); mouth.setFilled(true); mouth.setColor(Color.WHITE); add(mouth); } }

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