added Javadoc comment

ChrisMayfield · ChrisMayfield · commit fe4a34958400 · 2016-03-09T13:29:42.000-05:00
diff --git a/ch06/Series.java b/ch06/Series.java
@@ -68,16 +68,22 @@ public static double absoluteValue(double x) {
         return area(distance(xc, yc, xp, yp));
     }
 
+    /**
+     * Tests whether x is a single digit integer.
+     * 
+     * @param x the integer to test
+     * @return true if x has one digit, false otherwise
+     */
     public static boolean isSingleDigit(int x) {
-        if (x >= 0 && x < 10) {
+        if (x > -10 && x < 10) {
             return true;
         } else {
             return false;
         }
     }
 
     public static boolean isSingleDigit2(int x) {
-        return x >= 0 && x < 10;
+        return x > -10 && x < 10;
     }
 
     public static int factorial(int n) {

Original file line number	Diff line number	Diff line change
`@@ -68,16 +68,22 @@ public static double absoluteValue(double x) {`
`68`	`68`	`return area(distance(xc, yc, xp, yp));`
`69`	`69`	`}`
`70`	`70`
	`71`	`+ /**`
	`72`	`+ * Tests whether x is a single digit integer.`
	`73`	`+ *`
	`74`	`+ * @param x the integer to test`
	`75`	`+ * @return true if x has one digit, false otherwise`
	`76`	`+ */`
`71`	`77`	`public static boolean isSingleDigit(int x) {`
`72`		`- if (x >= 0 && x < 10) {`
	`78`	`+ if (x > -10 && x < 10) {`
`73`	`79`	`return true;`
`74`	`80`	`} else {`
`75`	`81`	`return false;`
`76`	`82`	`}`
`77`	`83`	`}`
`78`	`84`
`79`	`85`	`public static boolean isSingleDigit2(int x) {`
`80`		`- return x >= 0 && x < 10;`
	`86`	`+ return x > -10 && x < 10;`
`81`	`87`	`}`
`82`	`88`
`83`	`89`	`public static int factorial(int n) {`