Create Power exercise

This is just part 3 of the RowsCols exercise.
Thought it'd be easier for students and
teachers to split the exercises.

Author: phrdang

src/com/codefortomorrow/intermediate/chapter10/practice/Power.java

@@ -0,0 +1,24 @@
+package com.codefortomorrow.intermediate.chapter10.practice;
+
+/*
+Power
+
+Fill a 5 x 4 integer array according to
+the following pattern:
+
+4	9   16    25
+8	27	64	  125
+16	81	256	  625
+32	243	1024  3125
+64	729	4096  15625
+
+Print the values in 5 rows of 4 elements.
+Use nested loops to fill the values into the array,
+rather than just declaring the values initially.
+*/
+
+public class Power {
+    public static void main(String[] args) {
+        // write code here
+    }
+}

src/com/codefortomorrow/intermediate/chapter10/solutions/Power.java

@@ -0,0 +1,36 @@
+package com.codefortomorrow.intermediate.chapter10.solutions;
+
+/*
+Power
+
+Fill a 5 x 4 integer array according to
+the following pattern:
+
+4	9   16    25
+8	27	64	  125
+16	81	256	  625
+32	243	1024  3125
+64	729	4096  15625
+
+Print the values in 5 rows of 4 elements.
+Use nested loops to fill the values into the array,
+rather than just declaring the values initially.
+*/
+
+public class Power {
+    public static void main(String[] args) {
+        // create a 5x4 array
+		int[][] array = new int[5][4];
+ 
+		for (int power = 2; power < 7; power++) {
+			for (int base = 2; base < 6; base++) {
+				// assign the correct element based on the pattern
+				array[power - 2][base - 2] = (int) (Math.pow(base, power));
+
+				// print the current element
+				System.out.print(array[power - 2][base - 2] + "\t");
+			}
+			System.out.println(); // move to next row
+		}
+    }
+}