ch 03 work

nd1 · nd1 · commit 90209567d626 · 2017-07-15T18:56:57.000-04:00
diff --git a/ch03/Convert.java b/ch03/Convert.java
@@ -22,6 +22,9 @@ public static void main(String[] args) {
         remainder = inches % IN_PER_FOOT;
         System.out.printf("%.2f cm = %d ft, %d in\n",
                           cm, feet, remainder);
+        
+        //close the scanner
+        in.close();
     }
 
 }
diff --git a/ch03/Echo.java b/ch03/Echo.java
@@ -13,6 +13,9 @@ public static void main(String[] args) {
         System.out.print("Type something else: ");
         line = in.nextLine();
         System.out.println("You also said: " + line);
+        
+        // close the scanner
+        in.close();
     }
 
 }
diff --git a/ch03/GuessStarter.java b/ch03/GuessStarter.java
@@ -1,15 +1,39 @@
-import java.util.Random;
-
 /**
- * Starter code for the "Guess My Number" exercise.
+ * "Guess My Number" exercise.
  */
+
+import java.util.Random;
+import java.util.Scanner;
+
 public class GuessStarter {
 
     public static void main(String[] args) {
-        // pick a random number
+    	
+    	int difference;
+        
+    	// pick a random number
         Random random = new Random();
         int number = random.nextInt(100) + 1;
-        System.out.println(number);
+        
+        System.out.println("I'm thinking of a number between 1 and 100\n(including both)"
+        		+ ". Can you guess what it is?");
+        System.out.println("Type a number: ");
+        
+        Scanner scannerIn = new Scanner(System.in);
+        int guess = scannerIn.nextInt();
+        
+        System.out.println("Your guess is: " + guess);
+        System.out.println("The number I was thinking of is: " + number);
+        
+        if (guess > number) {
+        	difference = guess - number;
+        }
+        else {
+        	difference = number - guess;
+        }
+        System.out.println("You were off by: " + difference);
+        
+        scannerIn.close();
     }
 
 }
diff --git a/ch03/ScannerBug.java b/ch03/ScannerBug.java
@@ -18,9 +18,13 @@ public static void main(String[] args) {
 
         System.out.print("What is your age? ");
         age = in.nextInt();
+        in.nextLine();  // read the newline
         System.out.print("What is your name? ");
         name = in.nextLine();
         System.out.printf("Hello %s, age %d\n", name, age);
+        
+        // close the scanner
+        in.close();
     }
 
 }

Original file line number	Diff line number	Diff line change
`@@ -22,6 +22,9 @@ public static void main(String[] args) {`
`22`	`22`	`remainder = inches % IN_PER_FOOT;`
`23`	`23`	`System.out.printf("%.2f cm = %d ft, %d in\n",`
`24`	`24`	`cm, feet, remainder);`
	`25`	`+`
	`26`	`+ //close the scanner`
	`27`	`+ in.close();`
`25`	`28`	`}`
`26`	`29`
`27`	`30`	`}`
Original file line number	Diff line number	Diff line change
`@@ -13,6 +13,9 @@ public static void main(String[] args) {`
`13`	`13`	`System.out.print("Type something else: ");`
`14`	`14`	`line = in.nextLine();`
`15`	`15`	`System.out.println("You also said: " + line);`
	`16`	`+`
	`17`	`+ // close the scanner`
	`18`	`+ in.close();`
`16`	`19`	`}`
`17`	`20`
`18`	`21`	`}`
Original file line number	Diff line number	Diff line change
`@@ -18,9 +18,13 @@ public static void main(String[] args) {`
`18`	`18`
`19`	`19`	`System.out.print("What is your age? ");`
`20`	`20`	`age = in.nextInt();`
	`21`	`+ in.nextLine(); // read the newline`
`21`	`22`	`System.out.print("What is your name? ");`
`22`	`23`	`name = in.nextLine();`
`23`	`24`	`System.out.printf("Hello %s, age %d\n", name, age);`
	`25`	`+`
	`26`	`+ // close the scanner`
	`27`	`+ in.close();`
`24`	`28`	`}`
`25`	`29`
`26`	`30`	`}`