diff --git a/c-basic/hex_read_scanf.c b/c-basic/hex_read_scanf.c
index e948d16..a6e7fa5 100644
--- a/c-basic/hex_read_scanf.c
+++ b/c-basic/hex_read_scanf.c
@@ -2,7 +2,7 @@
 
 int main()
 {
-  unsigned int a;
+  int a, b;
 
   printf("Enter your number : ");
   scanf("%x", &a);