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ChrisMayfieldChrisMayfield
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reviewed appendixes
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Lines changed: 73 additions & 57 deletions

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‎appb/DigitUtil.java‎

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/**
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* Utility class for extracting digits from integers.
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*
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* @author Chris Mayfield
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* @version 1.0
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*/
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public class DigitUtil {
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/**
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* Tests whether x is a single digit integer.
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*
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* @param x the integer to test
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* @return true if x has one digit, false otherwise
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*/
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public static boolean isSingleDigit(int x) {
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if (x > -10 && x < 10) {
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return true;
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} else {
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return false;
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}
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}
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public static boolean isSingleDigit2(int x) {
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return x > -10 && x < 10;
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}
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public static void main(String[] args) {
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System.out.println(isSingleDigit(2));
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boolean bigFlag = !isSingleDigit(17);
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int z = 9;
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if (isSingleDigit(z)) {
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System.out.println("z is small");
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} else {
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System.out.println("z is big");
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}
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}
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}

‎appb/Goodbye.java‎

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/**
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* Example program that demonstrates print vs println.
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*/
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public class Goodbye {
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/**
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* Prints a greeting.
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*/
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public static void main(String[] args) {
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System.out.print("Goodbye, "); // note the space
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System.out.println("cruel world");
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}
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}

‎appe/Digit.java‎

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This file was deleted.

‎appe/Tables.java‎

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@@ -43,19 +43,3 @@ public static void main(String[] args) {
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}
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}
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public static void printTable4(int rows) {
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for (int i = 1; i <= rows; i = i + 1) {
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printRow3(i, rows);
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}
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}
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public static void printRow4(int n, int cols) {
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int i;
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for (i = 1; i <= cols; i = i + 1) {
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System.out.printf("%4d", n * i);
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}
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System.out.println(i);
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}
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‎appe/Unreachable.java‎

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public class Unreachable {
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public static double absoluteValue(double x) {
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if (x < 0) {
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return -x;
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} else {
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return x;
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}
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}
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public static void main(String[] args) {
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System.out.println("absolute value");
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System.out.println(absoluteValue(-2));
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}
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}

‎appe/Vowels.java‎

Lines changed: 5 additions & 1 deletion
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@@ -1,9 +1,12 @@
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/**
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* Example switch statement with cases that fall through.
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*/
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public class Vowels {
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public static void main(String[] args) {
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String s = "Ahoy!";
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for (int i = 0; i < s.length(); i++) {
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// display the next character
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char c = s.charAt(i);
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System.out.print(c + " is a ");
@@ -39,4 +42,5 @@ public static void main(String[] args) {
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}
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}
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}
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}

‎ch05/Circle.java‎

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*/
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public class Circle {
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public static double absoluteValue(double x) {
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if (x < 0) {
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return -x;
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} else {
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return x;
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}
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}
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public static double calculateArea(double radius) {
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double result = Math.PI * radius * radius;
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return result;
@@ -61,9 +53,6 @@ public static double calculateArea2(double radius) {
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public static void main(String[] args) {
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System.out.println("absolute value");
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System.out.println(absoluteValue(-2));
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System.out.println("calculateArea");
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System.out.println(calculateArea(3.0));
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‎ch08/Series.java‎

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*/
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public class Series {
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public static boolean isSingleDigit(int x) {
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return x > -10 && x < 10;
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}
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public static int factorial(int n) {
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if (n == 0) {
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return 1;
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public static void main(String[] args) {
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int z = 9;
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if (isSingleDigit(z)) {
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System.out.println("z is small");
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} else {
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System.out.println("z is big");
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}
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System.out.println("factorial");
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System.out.println(factorial(3));
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