diff --git a/AB.cpp b/class/AB.cpp
similarity index 100%
rename from AB.cpp
rename to class/AB.cpp
diff --git a/class/test.cpp b/class/test.cpp
new file mode 100644
index 0000000..b0da871
--- /dev/null
+++ b/class/test.cpp
@@ -0,0 +1,13 @@
+#include<iostream>
+#include<iomanip>
+
+using namespace std;
+
+int main(){
+    int a,b,c;
+    a = 3;
+    b = 4;
+    c = a * a + b * b;
+    cout <<a<<"*"<<a<<"+"<<b<<"*"<<b<<"="<<setprecision(2)<<c<<endl;
+    return 0;
+}
\ No newline at end of file
diff --git a/class/test1.cpp b/class/test1.cpp
new file mode 100644
index 0000000..6249032
--- /dev/null
+++ b/class/test1.cpp
@@ -0,0 +1,12 @@
+#include<iostream>
+
+using namespace std;
+
+int main(){
+
+
+    float jg = 4/8 * 100 /2.0;
+
+    cout <<"结果:"<<jg;
+    return 0;
+}
\ No newline at end of file