(feat) Lab 7 - string formatting implemented

Plus placeholder for lab 6 exercise 9 (rock-paper-scissors)

week1.java

@@ -7,6 +7,7 @@ class runLabs {
         new Lab4();
         new Lab5();
         new Lab6();
+        new Lab7();
     }
 }
 
@@ -256,6 +257,7 @@ class Lab6 extends Lab {
         new six6();
         new six7();
         new six8();
+        new six9();
     }
 
     /**
@@ -384,6 +386,12 @@ class Lab6 extends Lab {
 
     }
 
+    class six9 extends Exercise {
+        public six9() {
+            super(9);
+            System.out.println(String.format("TODO: ro sham bo once we have stdin working"));
+        }
+    }
     /* TOASK - is there a better way of returning multiple values in Java?
        à la python, ie: return (quotient, remainder)
     */
@@ -521,3 +529,45 @@ class Lab6 extends Lab {
         }
     }
 }
+
+/**
+ * String formatting
+ *
+ */
+class Lab7 extends Lab {
+        public Lab7() {
+            super(7);
+            writeTimesTable(8.24579, 10);
+            writeTimesTable(93.12279, 22);
+            writeTimesTable(193.12279, 22);
+            writeTimesTable(13.9, 122);
+        }
+
+        /**
+         * @param num   The number to write the times table for (0 <= num <= 99)
+         * @param limit How many multiples to show (0 <= limit <= 99)
+         */
+        public void writeTimesTable(double num, int limit) {
+            final double MINNUM = 0;
+            final double MAXNUM = 99;
+            final int MINLIMIT = 0;
+            final int MAXLIMIT = 99;
+
+            if ((num < MINNUM) || (num > MAXNUM)) {
+                System.err.println(String.format("Please specify a number between %.2f and %.2f (supplied: %.2f)",
+                                                 MINNUM, MAXNUM, num));
+                return;
+            }
+
+            if ((limit < MINLIMIT) || (limit > MAXLIMIT)) {
+                System.err.println(String.format("Please specify a limit between %d and %d (supplied: %d)",
+                                                 MINLIMIT, MAXLIMIT, limit));
+                return;
+            }
+            for (int i = 0; i < (limit + 1); i++) {
+                // output specification:
+                // ~~.~~~ x ~~ = ~~~~~.~~~
+                System.out.printf("%2.3f x %02d = %5.3f%n", num, i, (num*i));
+        }
+    }
+    }