diff --git a/Pointer_arithmetic.c b/Pointer_arithmetic.c
index 0ffec02..5b644d4 100644
--- a/Pointer_arithmetic.c
+++ b/Pointer_arithmetic.c
@@ -1,4 +1,5 @@
 #include<stdio.h>
+#include<stdlib.h>
 int main()
 {
   int a=5,*p=&a;