1 files changed, 11 insertions, 0 deletions
diff --git a/4/4.c b/4/4.c
index ccea5e8..ed443bf 100644
--- a/4/4.c
+++ b/4/4.c
@@ -28,6 +28,9 @@ double pop();
 /* returns a value from stack without removing it */
 double peek();
 
+/* clears the stack */
+void clear();
+
 /* adds commands p (print top val without popping), c (duplicate top val), s
  * (swap top two stack positions), d (clear stack) */
 int main(int argc, char *argv[]) {
@@ -76,6 +79,9 @@ int main(int argc, char *argv[]) {
       push(op2);
       push(op1);
       break;
+    case 'd':
+      clear();
+      break;
     case '\n':
       printf("\t%.8g\n", pop());
       break;
@@ -112,6 +118,11 @@ double peek() {
   }
 }
 
+void clear() {
+  for (; sp > 0; sp--)
+    ;
+}
+
 int getch() { return (bufp > 0) ? buf[--bufp] : getchar(); }
 
 void ungetch(int c) {