diff --git a/cv3/program.c b/cv3/program.c
index d6dcdad..6c10487 100644
--- a/cv3/program.c
+++ b/cv3/program.c
@@ -63,12 +63,17 @@ int read(struct stack *s) {
     }
 
     float value;
-    int scan = sscanf(temp, "%f", &value);
+    char extra;
+    int scan = sscanf(temp, "%f %c", &value, &extra);
 
-    // If it's a number
+    // If it's a properly formatted number
     if (scan == 1) {
         push_stack(s, value);
         print_stack(s);
+    } else if (scan > 1) {
+        // If extra characters were found, it's an invalid input like .23.4
+        printf("bad input\n");
+        exit(0);
     } else {
         switch (temp[0]) {
             case '+':
@@ -102,13 +107,14 @@ int read(struct stack *s) {
             }
             default:
                 printf("bad input\n");
-                exit(0); // Continue on invalid input
+                exit(0); // Exit on invalid input
         }
     }
 
     return 1; // Continue the loop
 }
 
+
 int main() {
     struct stack my_stack;
     init(&my_stack);