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Task/Ternary-logic/Java/ternary-logic.java

@@ -0,0 +1,68 @@
+public class Logic{
+	public static enum Trit{
+		TRUE, MAYBE, FALSE;
+		
+		public Trit and(Trit other){
+			if(this == TRUE){
+				return other;
+			}else if(this == MAYBE){
+				return (other == FALSE) ? FALSE : MAYBE;
+			}else{
+				return FALSE;
+			}
+		}
+		
+		public Trit or(Trit other){
+			if(this == TRUE){
+				return TRUE;
+			}else if(this == MAYBE){
+				return (other == TRUE) ? TRUE : MAYBE;
+			}else{
+				return other;
+			}
+		}
+		
+		public Trit tIf(Trit other){
+			if(this == TRUE){
+				return other;
+			}else if(this == MAYBE){
+				return (other == TRUE) ? TRUE : MAYBE;
+			}else{
+				return TRUE;
+			}
+		}
+		
+		public Trit not(){
+			if(this == TRUE){
+				return FALSE;
+			}else if(this == MAYBE){
+				return MAYBE;
+			}else{
+				return TRUE;
+			}
+		}
+		
+		public Trit equals(Trit other){
+			if(this == TRUE){
+				return other;
+			}else if(this == MAYBE){
+				return MAYBE;
+			}else{
+				return other.not();
+			}
+		}
+	}
+	public static void main(String[] args){
+		for(Trit a:Trit.values()){
+			System.out.println("not " + a + ": " + a.not());
+		}
+		for(Trit a:Trit.values()){
+			for(Trit b:Trit.values()){
+				System.out.println(a+" and "+b+": "+a.and(b)+
+						"\t "+a+" or "+b+": "+a.or(b)+
+						"\t "+a+" implies "+b+": "+a.tIf(b)+
+						"\t "+a+" = "+b+": "+a.equals(b));
+			}
+		}
+	}
+}