diff --git a/lyx.10.md b/lyx.10.md
new file mode 100644
index 0000000..be49cca
--- /dev/null
+++ b/lyx.10.md
@@ -0,0 +1,23 @@
+void AsSortbyNum(STU stu[], int n, int m)
+{
+    int  i, j, k, t;
+    for (i=0; i<n-1; i++)
+    {
+        k = i;
+        for (j=i+1; j<n; j++)
+        {
+            if (stu[j].num < stu[k].num)    k = j;
+        }
+        if (k != i)
+        {
+            for (t=0; t<m; t++)          
+              {
+                   SwapFloat(&stu[k].score[t], &stu[i].score[t]);
+            }
+SwapFloat(&stu[k].sum, &stu[i].sum);  
+SwapFloat(&stu[k].aver, &stu[i].aver);   
+SwapLong(&stu[k].num, &stu[i].num);     
+SwapChar(stu[k].name, stu[i].name);  
+        }
+    }
+}