diff --git a/test100.cpp b/test100.cpp
index a98d9bb..55f6b4f 100644
--- a/test100.cpp
+++ b/test100.cpp
@@ -2,5 +2,11 @@
 using namespace std;
 
 int main(){
+    string s = "hello world";
+    char *str = "hello world";
+    char *str_1 = &str[2];
+    str++;
+    cout << str << endl;
+
     return 0;
 }
\ No newline at end of file