now subtraction

1 files changed, 3 insertions, 5 deletions

diff --git a/expr.y b/expr.y
index 950a772..1060e27 100644
--- a/expr.y
+++ b/expr.y
@@ -21,13 +21,11 @@ static void breakpoint(void) { }
 %%
 
 expr	: STRING {
-		printf("string\n");
 	}
 
 	| INTEGER {
-		printf("integer %d\n", $1.u.i);
 	}
-	
+
 	| '(' expr ')' {
 		printf("a parenthesized expression\n");
 	}
@@ -41,13 +39,13 @@ expr	: STRING {
 	}
 
 	| expr '+' expr {
-		printf("plus\n");
 		$$.u.i = $1.u.i + $3.u.i;
 		printf("%d\n", $$.u.i);
 	}
 
 	| expr '-' expr {
-		printf("minus\n");
+		$$.u.i = $1.u.i - $3.u.i;
+		printf("%d\n", $$.u.i);
 	}
 
 	| expr COMPARISON expr {