Add 'ex1.cpp'

ex1.cpp

@@ -0,0 +1,20 @@
+#include <vector>
+#include <iostream>
+
+class MyClass{
+    public:
+    int val=0;
+    MyClass(int val)
+    :val(val){};
+};
+
+int main() {
+    std::vector<MyClass> myitems;
+    for (int i=0;i<20;i++) {
+        myitems.push_back({i});
+    }
+    for (int i=0;i<myitems.size();i++) {
+        (&myitems[i])->val++;
+        std::cout<<myitems[i].val<<"\n";
+    }
+}