C with classes

C/BasicSyntax/test.cpp

@@ -0,0 +1,13 @@
+#include <iostream>
+using namespace std;
+int main()
+{
+    int n;
+    cin>>n;
+    int s=0;
+    for(int i=1;i<=n;i++){
+        s+=i;
+    }
+    cout<<s<<endl;
+    return 0;
+}