3 files changed, 12 insertions, 1 deletions
diff --git a/pc.y b/pc.y
index d679c18..ca94f5d 100644
--- a/pc.y
+++ b/pc.y
@@ -402,5 +402,11 @@ factor
 	{
 		$$ = mktree(NOT, $2, NULL);
 	}
+	|ADDOP factor{
+		if ($1 != SUB)
+			yyerror("SUB NOT CORRECT\n");
+		else
+			$$ = mktree(SUB, $2, NULL);
+	}
 ;
 
diff --git a/sem_check.c b/sem_check.c
index 773c70a..aa83155 100644
--- a/sem_check.c
+++ b/sem_check.c
@@ -54,7 +54,7 @@ ptree *t;
 		if (!(t->r && t->l))
 			yyerror("Missing nodes\n");
 
-		if (t->attr.opval == ADD || t->attr.opval == OR) {
+		if (t->attr.opval == AND || t->attr.opval == OR) {
 			if(t->l->ret_type == BOOL && t->r->ret_type ==BOOL)
 				return BOOL;
 			else {
@@ -162,6 +162,8 @@ ptree *t;
 		if (t->l->ret_type == 1 && t->r->ret_type == INT)
 			return 1;
 		snprintf(buf, 100, "Incorrect types HERE...\n");
+	case SUB:
+		return t->l->ret_type;
 		break;
 	default:
 		return -200;
diff --git a/tree.c b/tree.c
index bb025f5..2afdfa6 100644
--- a/tree.c
+++ b/tree.c
@@ -182,6 +182,9 @@ int spaces;
 		case DT:
 			fprintf(stderr, "[DOWN-TO]");
 			break;
+		case SUB:
+			fprintf(stderr, "[SUB]");
+			break;
 		default:
 			fprintf(stderr, "\t%d", t->type);
 			yyerror("Error in tree_print");