diff --git a/_03.串/_a.串.c b/_03.串/_a.串.c
index 922a2a7..45fef31 100644
--- a/_03.串/_a.串.c
+++ b/_03.串/_a.串.c
@@ -2,7 +2,7 @@
  * @Author: Xu Bai
  * @Date: 2019-07-06 22:20:08
  * @LastEditors: Xu Bai
- * @LastEditTime: 2019-07-07 23:05:20
+ * @LastEditTime: 2019-07-07 23:21:21
  */
 
 #include "string.h"
@@ -172,6 +172,7 @@ int Index(String S, String T, int pos)
     }
     if (j > T[0])
     {
+        //ÕÒµ½ÁËÆ¥ÅäλÖÃ
         return i - T[0];
     }
     else
@@ -180,6 +181,37 @@ int Index(String S, String T, int pos)
     }
 }
 
+int index2(String S, String T, int pos)
+{
+    // TΪ·Ç¿Õ´®¡£ÈôÖ÷´®SÖдæÔÚµÚpos¸ö×Ö·ûÖ®ºó´æÔÚÓëTÏàµÈµÄ×Ó´®
+    // Ôò·µ»ØµÚÒ»¸öÕâÑùµÄ×Ó´®ÔÚSÖеÄλÖ㬷ñÔò·µ»Ø0
+    int n, m, i;
+    String sub;
+    if (pos > 0)
+    {
+        n = StrLength(S); //Ö÷´®
+        m = StrLength(T); //×Ó´®
+        i = pos;
+        while (i <= n - m + 1)
+        {
+            SubString(sub, S, i, m);
+            //È¡×Ó´®ÖеÚi¸öλÖó¤¶ÈÓëTÏàµÈµÄ×Ó´®¸øsub
+            if (StrCompare(sub, T) != 0)
+            {
+                ++i;
+            }
+            else
+            {
+                // Á½´®ÏàµÈ
+                return i;
+            }
+        }
+    }
+    return 0;
+}
+
+
+
 // Status Replace(String S,String T, String V){
 //     // ÓÃVÌæ»»Ö÷´®SÖгöÏÖµÄËùÓÐÓëTÏàµÈµÄ²»ÖصþµÄ×Ó´®
 //     int i =1;