Add != operator

README.md

@@ -213,7 +213,9 @@ Implicit multiplication - `xy` is identical to `x*y`, `3x` is identical to `3*x`
 
 `false` - Boolean constant representing 0
 
-`=` - Compare if two numbers are equal (`1 = 1` will be `1`, `1 = 3` will be 0)
+`=` - Compare if two numbers are equal (`1 = 1` will be `1`, `1 = 3` will be `0`)
+
+`!=` - Compare if two numbers are not equal (`1 != 2` will be `1`, `1 != 1` will be `0`)
 
 `>` - Compare if one number is greater than another (`1 > 0`)
 

src/redempt/crunch/token/Operator.java

@@ -15,6 +15,7 @@ public enum Operator implements Token {
 	GREATER_THAN(">", 1, (a, b) -> a > b ? 1d : 0d),
 	LESS_THAN("<", 1, (a, b) -> a < b ? 1d : 0d),
 	EQUAL_TO("=", 1, (a, b) -> a == b ? 1d : 0d),
+	NOT_EQUAL_TO("!=", 1, (a, b) -> a != b ? 1d : 0d),
 	GREATER_THAN_OR_EQUAL_TO(">=", 1, (a, b) -> a >= b ? 1d : 0d),
 	LESS_THAN_OR_EQUAL_TO("<=", 1, (a, b) -> a <= b ? 1d : 0d),
 	BOOLEAN_NOT("!", 9, d -> d == 0 ? 1d : 0d),

test/redempt/crunch/test/CrunchTest.java

@@ -53,6 +53,7 @@ public void booleanLogicTest() {
 		assertEquals(1, Crunch.evaluateExpression("true | false"), "Boolean or");
 		assertEquals(0, Crunch.evaluateExpression("true & (true & false | false)"), "More complex boolean expression");
 		assertEquals(1, Crunch.evaluateExpression("1 = 1 & 3 = 3"), "Arithmetic comparisons");
+		assertEquals(1, Crunch.evaluateExpression("1 != 2 & 3 != 4"), "Using !=");
 	}
 
 	@Test