sync with 6.1.2

AllenDowney · Dec 27, 2016 · 9fb1ef4 · 9fb1ef4
1 parent 390cbbe
commit 9fb1ef4
Show file tree

Hide file tree

Showing 2 changed files with 9 additions and 9 deletions.
diff --git a/ch05/Logarithm.java b/ch05/Logarithm.java
@@ -6,11 +6,13 @@ public static void main(String[] args) {
         System.out.println("printLogarithm");
         printLogarithm(3.0);
 
+        Scanner in = new Scanner(System.in);
+
         System.out.println("scandouble");
-        scanDouble();
+        scanDouble(in);
 
         System.out.println("scandouble2");
-        scanDouble2();
+        scanDouble2(in);
     }
 
     public static void printLogarithm(double x) {
@@ -22,15 +24,13 @@ public static void printLogarithm(double x) {
         System.out.println("The log of x is " + result);
     }
 
-    public static void scanDouble() {
-        Scanner in = new Scanner(System.in);
+    public static void scanDouble(Scanner in) {
         System.out.print("Enter a number: ");
         double x = in.nextDouble();
         printLogarithm(x);
     }
 
-    public static void scanDouble2() {
-        Scanner in = new Scanner(System.in);
+    public static void scanDouble2(Scanner in) {
         System.out.print("Enter a number: ");
         if (!in.hasNextDouble()) {
             String word = in.next();

diff --git a/ch07/Tables.java b/ch07/Tables.java
@@ -6,7 +6,7 @@ public class Tables {
     public static void example() {
         int i = 1;
         while (i < 10) {
-            double x = (double) i;
+            double x = i;
             System.out.println(x + "   " + Math.log(x));
             i = i + 1;
         }
@@ -15,7 +15,7 @@ public static void example() {
     public static void example2() {
         int i = 1;
         while (i < 10) {
-            double x = (double) i;
+            double x = i;
             System.out.println(x + "   " + Math.log(x) / Math.log(2));
             i = i + 1;
         }
@@ -25,7 +25,7 @@ public static void example3() {
         final double LOG2 = Math.log(2);
         int i = 1;
         while (i < 100) {
-            double x = (double) i;
+            double x = i;
             System.out.println(x + "   " + Math.log(x) / LOG2);
             i = i * 2;
         }