1 files changed, 5 insertions, 6 deletions
diff --git a/clox/src/vm.c b/clox/src/vm.c
index ffd207d..e05a0c8 100644
--- a/clox/src/vm.c
+++ b/clox/src/vm.c
@@ -6,13 +6,9 @@
 
 VM vm;
 
-static void resetStack() {
-  vm.stackTop = vm.stack;
-}
+static void resetStack() { vm.stackTop = vm.stack; }
 
-void initVM() {
-  resetStack();
-}
+void initVM() { resetStack(); }
 
 void freeVM() {}
 
@@ -49,6 +45,9 @@ static InterpretResult run() {
       push(constant);
       break;
     }
+    case OP_NEGATE:
+      push(-pop());
+      break;
     case OP_RETURN: {
       printValue(pop());
       printf("\n");