diff --git a/class.cpp b/class.cpp
new file mode 100644
index 0000000..9b0389f
--- /dev/null
+++ b/class.cpp
@@ -0,0 +1,20 @@
+#include<iostream>
+
+using namespace std;
+
+int main(){
+    long long cheng=1,num2,num1;
+    cout <<"请输入第一个数字:";
+    cin >>num1;
+
+    cout <<"请输第二个数字,每输一个数字,空一格,再输一个数字(Enter结束):";
+    for (int i = 1; i <= num1; i++)
+    {
+        cin >>num2;
+        cheng *=num2;
+    }
+    
+    cout <<cheng<<endl;
+    
+    return 0;
+}
\ No newline at end of file
diff --git a/class/dao_ji_shi.cpp b/class/dao_ji_shi.cpp
new file mode 100644
index 0000000..1ba2646
--- /dev/null
+++ b/class/dao_ji_shi.cpp
@@ -0,0 +1,17 @@
+//倒计时
+
+#include<iostream>
+#include<windows.h>
+
+using namespace std;
+
+int main(){
+    for (int i = 15; i > 0; i--)
+    {
+        cout <<"距离考试结束还剩:"<<i<<"分钟"<<endl;
+        Sleep(60000);
+    }
+    cout <<"考试结束!"<<endl;
+    
+    return 0;
+}
\ No newline at end of file