diff --git a/class/shu_zi_jv_xin.cpp b/class/shu_zi_jv_xin.cpp
index ca78f62..6930807 100644
--- a/class/shu_zi_jv_xin.cpp
+++ b/class/shu_zi_jv_xin.cpp
@@ -12,8 +12,7 @@ int main(){
         for (int i = 1; i <= n; i++)
         {
             cout <<"456"<<endl;
-        }
-                
+        }    
     }
     
     return 0;
diff --git a/zheng_san_jiao_xin.cpp b/zheng_san_jiao_xin.cpp
new file mode 100644
index 0000000..346f09c
--- /dev/null
+++ b/zheng_san_jiao_xin.cpp
@@ -0,0 +1,27 @@
+//正三角形
+
+#include<iostream>
+#include<windows.h>
+
+using namespace std;
+
+int main(){
+    int n;
+    cin >>n;
+
+    for (int i = 1; i <= n; i++)
+    {
+        for (int y = 1; y <= n-i; ++y)
+        {
+            cout <<" ";
+        }
+        
+        for (int j = 1; j <= 2*i-1; ++j)
+        {
+            cout <<"*";
+        }
+        cout <<endl;
+    }
+    //Sleep(1000000000);
+    return 0;
+}
\ No newline at end of file
diff --git a/zhi_jiao_san_jiao_cin.cpp b/zhi_jiao_san_jiao_cin.cpp
new file mode 100644
index 0000000..586f4c5
--- /dev/null
+++ b/zhi_jiao_san_jiao_cin.cpp
@@ -0,0 +1,22 @@
+//直角三角形
+#include<iostream>
+#include<string>
+
+using namespace std;
+
+int main(){
+    int n;
+    cin >>n;
+    string xin = "*";
+
+    for (int i = 1; i <= n; i++)
+    {
+        for (int j = 1; j <= i; ++j)
+        {
+            cout <<xin;
+        }
+        cout <<endl;
+    }
+    
+    return 0;
+}