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Commit 8ddb25f

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ChrisMayfieldChrisMayfield
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ch05 revisions
1 parent 5af8617 commit 8ddb25f
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‎ch05/ChainNest.java‎

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+25Lines changed: 25 additions & 0 deletions
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public class ChainNest {
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public static void main(String[] args) {
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int x = 0;
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if (x > 0) {
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System.out.println("x is positive");
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} else if (x < 0) {
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System.out.println("x is negative");
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} else {
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System.out.println("x is zero");
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}
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if (x > 0) {
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System.out.println("x is positive");
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} else {
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if (x < 0) {
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System.out.println("x is negative");
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} else {
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System.out.println("x is zero");
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}
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}
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}
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}
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‎ch05/Conditional.java‎

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-50Lines changed: 0 additions & 50 deletions
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‎ch05/DigitUtil.java‎

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+27Lines changed: 27 additions & 0 deletions
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public class DigitUtil {
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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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}
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‎ch05/IfElse.java‎

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+32Lines changed: 32 additions & 0 deletions
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public class IfElse {
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public static void main(String[] args) {
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int x = 17;
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int n = 18;
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if (x > 0) {
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System.out.println("x is positive");
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}
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if (x % 2 == 0) {
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System.out.println("x is even");
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} else {
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System.out.println("x is odd");
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}
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// look, no braces...bad idea!
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if (x % 2 == 0)
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System.out.println("x is even");
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else
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System.out.println("x is odd");
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if (x > 0)
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System.out.println("x is positive");
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System.out.println("x is not zero");
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if (x % 2 == 0); { // incorrect semicolon
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System.out.println("x is even");
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}
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}
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}
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‎ch05/Logarithm.java‎

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+1-1Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -20,7 +20,7 @@ public static void main(String[] args) {
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// check the range
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double x = in.nextDouble();
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if (x >= 0) {
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if (x > 0) {
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double y = Math.log(x);
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System.out.println("The log is " + y);
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} else {
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‎ch05/LogicalOpers.java‎

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+56Lines changed: 56 additions & 0 deletions
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public class LogicalOpers {
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public static void main(String[] args) {
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int x = 0;
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int y = 0;
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// nested
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if (x == 0) {
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if (y == 0) {
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System.out.println("Both x and y are zero");
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}
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}
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// combined
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if (x == 0 && y == 0) {
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System.out.println("Both x and y are zero");
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}
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// chained
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if (x == 0) {
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System.out.println("Either x or y is zero");
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} else if (y == 0) {
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System.out.println("Either x or y is zero");
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}
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// combined
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if (x == 0 || y == 0) {
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System.out.println("Either x or y is zero");
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}
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// De Morgan's
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if (!(x == 0 || y == 0)) {
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System.out.println("Neither x nor y is zero");
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}
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if (x != 0 && y != 0) {
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System.out.println("Neither x nor y is zero");
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}
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// boolean variables
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boolean flag;
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flag = true;
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boolean testResult = false;
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boolean evenFlag = (x % 2 == 0); // true if x is even
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boolean positiveFlag = (x > 0); // true if x is positive
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if (evenFlag) {
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System.out.println("n was even when I checked it");
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}
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if (!evenFlag) {
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System.out.println("n was odd when I checked it");
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}
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}
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}
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‎ch05/Switch.java‎

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+56Lines changed: 56 additions & 0 deletions
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public class Switch {
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public static void main(String[] args) {
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int number = 0;
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String word;
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// if-else-if
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if (number == 1) {
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word = "one";
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} else if (number == 2) {
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word = "two";
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} else if (number == 3) {
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word = "three";
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} else {
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word = "unknown";
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}
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// same result as above
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switch (number) {
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case 1:
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word = "one";
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break;
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case 2:
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word = "two";
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break;
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case 3:
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word = "three";
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break;
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default:
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word = "unknown";
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break;
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}
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System.out.print(number);
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System.out.print(word);
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// switch blocks fall through
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String food = "apple";
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switch (food) {
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case "apple":
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case "banana":
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case "cherry":
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System.out.println("Fruit!");
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break;
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case "asparagus":
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case "broccoli":
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case "carrot":
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System.out.println("Vegetable!");
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break;
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}
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}
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}

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