Data update

Task/Modular-inverse/Java/modular-inverse-2.java

@@ -0,0 +1,22 @@
+public final class ModularInverse {
+
+	public static void main(String[] aArgs) {
+		System.out.println(inverseModulus(42, 2017));
+	}
+	
+	private static Egcd extendedGCD(int aOne, int aTwo) {
+		if ( aOne == 0 ) {
+	        return new Egcd(aTwo, 0, 1);
+		}
+	    Egcd value = extendedGCD(aTwo % aOne, aOne);	
+	    return new Egcd(value.aG, value.aY - ( aTwo / aOne ) * value.aX, value.aX);	
+	}
+	    		
+	private static int inverseModulus(int aNumber, int aModulus) {
+	    Egcd value = extendedGCD(aNumber, aModulus);
+	    return ( value.aG == 1 ) ? ( value.aX + aModulus ) % aModulus : 0;
+	}
+	
+	private static record Egcd(int aG, int aX, int aY) {}
+
+}