diff --git a/my_search.py b/my_search.py
index 6eaf4dc..52629a6 100644
--- a/my_search.py
+++ b/my_search.py
@@ -6,4 +6,21 @@ for i in range(1, 101):
 num = random.choice(alist)
 # 请完善二分查找函数binary_search(),查找出num在列表alist里面的索引位置
 
-def binary_search(alist,num):
\ No newline at end of file
+def binary_search(alist,num):
+    low=0
+    high=len(alist)-1
+    while low<=high:
+        mid=(low+high)//2
+        guess=alist[mid]
+        if guess==num:
+            return mid
+        elif guess<num:
+            low=mid+1
+        else:
+            high=mid-1
+    result None
+result=binary_search(alist,num)
+print("老师给的数是:",num)
+print("它是",result)
+            
+        
\ No newline at end of file