Initial data commit

Task/Ethiopian-multiplication/Java/ethiopian-multiplication-2.java

@@ -0,0 +1,51 @@
+/**
+ * This method will use ethiopian styled multiplication.
+ * @param a Any non-negative integer.
+ * @param b Any integer.
+ * @result a multiplied by b
+ */
+public static int ethiopianMultiply(int a, int b) {
+  if(a==0 || b==0) {
+    return 0;
+  }
+  int result = 0;
+  while(a>=1) {
+    if(!isEven(a)) {
+      result+=b;
+    }
+    b = doubleInt(b);
+    a = halveInt(a);
+  }
+  return result;
+}
+
+/**
+ * This method is an improved version that will use
+ * ethiopian styled multiplication, and also
+ * supports negative parameters.
+ * @param a Any integer.
+ * @param b Any integer.
+ * @result a multiplied by b
+ */
+public static int ethiopianMultiplyWithImprovement(int a, int b) {
+  if(a==0 || b==0) {
+    return 0;
+  }
+  if(a<0) {
+    a=-a;
+    b=-b;
+  } else if(b>0 && a>b) {
+    int tmp = a;
+    a = b;
+    b = tmp;
+  }
+  int result = 0;
+  while(a>=1) {
+    if(!isEven(a)) {
+      result+=b;
+    }
+    b = doubleInt(b);
+    a = halveInt(a);
+  }
+  return result;
+}