diff --git a/sum.c b/sum.c
index 533a801..cb90204 100644
--- a/sum.c
+++ b/sum.c
@@ -11,11 +11,15 @@ int main() {
   int size = 1;
   int sum = 0;
   int pos = 0;
+  int end_scan = 1;
   int* arr = malloc(size * sizeof(int));
   
-  while(TRUE) {
+  while(end_scan) {
     printf("Enter a number: ");
-    scanf("%d", &(arr[pos]));
+    if (scanf("%d", &(arr[pos])) == EOF) {
+      end_scan = 0;
+    }
+    //scanf("%d", &(arr[pos]));
     if( arr[pos] == 0 ) {
       break;
     }