ch03 revisions

Author: ChrisMayfield

ch03/Formatting.java

@@ -0,0 +1,33 @@
+/**
+ * Examples from the middle of the chapter.
+ */
+public class Formatting {
+
+    public static void main(String[] args) {
+        final double CM_PER_INCH = 2.54;
+
+        System.out.println(System.out);
+
+        // formatting output
+
+        System.out.print(4.0 / 3.0);
+        System.out.printf("Four thirds = %.3f", 4.0 / 3.0);
+
+        int inch = 100;
+        double cm = inch * CM_PER_INCH;
+        System.out.printf("%d in = %f cm\n", inch, cm);
+
+        // type cast operators
+
+        double pi = 3.14159;
+        int xi = (int) pi;
+
+        double x = (int) pi * 20.0;  // result is 60.0, not 62.0
+
+        inch = (int) (cm / CM_PER_INCH);
+        System.out.printf("%f cm = %d in\n", cm, inch);
+
+        System.out.printf("inches = %d" + inch);  // error
+    }
+
+}

ch03/Input.java

@@ -0,0 +1,22 @@
+import java.util.Scanner;
+
+/**
+ * Converts inches to centimeters.
+ */
+public class Literals {
+
+    public static void main(String[] args) {
+        int inch;
+        double cm;
+        Scanner in = new Scanner(System.in);
+
+        System.out.print("How many inches? ");
+        inch = in.nextInt();
+
+        final double CM_PER_INCH = 2.54;
+        cm = inch * CM_PER_INCH;
+        System.out.print(inch + " in = ");
+        System.out.println(cm + " cm");
+    }
+
+}

ch03/Literals.java

@@ -16,6 +16,9 @@ public static void main(String[] args) {
         age = in.nextInt();
         System.out.printf("Hello %s, age %d\n", name, age);
 
+        in.reset();
+        System.out.println();
+
         System.out.print("What is your age? ");
         age = in.nextInt();
         System.out.print("What is your name? ");