Ethiopian multiplication: Difference between revisions

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 =={{header|D}}==
 <lang d>int ethiopian(int n1, int n2) {
+    if (n1 < 0) {
+        throw new Exception("muliplier cannot be negative");
+    }
     static int doubleNum(int n) { return n * 2; }
     static int halveNum(int n) { return n / 2; }