end of prac 4

Triangle.Compiler/src/main/java/triangle/optimiser/ConstantFolder.java

@@ -588,8 +588,16 @@ public class ConstantFolder implements ActualParameterVisitor<Void, AbstractSynt
 			
 			if (o.decl == StdEnvironment.addDecl) {
 				foldedValue = int1 + int2;
+			} else if(o.decl == StdEnvironment.multiplyDecl) {
+				foldedValue = int1 * int2;
+			} else if(o.decl == StdEnvironment.subtractDecl) {
+				foldedValue = int1 - int2;
+			} else if(o.decl == StdEnvironment.moduloDecl) {
+				foldedValue = int1 % int2;
+			} else if(o.decl == StdEnvironment.divideDecl) {
+				foldedValue = int1 / int2;
 			}
-
+			
 			if (foldedValue instanceof Integer) {
 				IntegerLiteral il = new IntegerLiteral(foldedValue.toString(), node1.getPosition());
 				IntegerExpression ie = new IntegerExpression(il, node1.getPosition());