Add std::cin cells to example notebooks (#329)

Author: mcbarton

notebooks/xeus-cpp-lite-demo.ipynb

@@ -110,14 +110,10 @@
       "execution_count": 4
     },
     {
-      "id": "ccf81e76-507a-42e5-9f83-99793f0eb46c",
-      "cell_type": "code",
-      "source": "# Interpreting the C++ programming language\n\nYou can define functions, classes, templates, etc ...",
-      "metadata": {
-        "trusted": true
-      },
-      "outputs": [],
-      "execution_count": null
+      "id": "a39c7021-ee9f-442e-8ea3-63ca23aa5d46",
+      "cell_type": "markdown",
+      "source": "# Interpreting the C++ programming language\n# You can define functions, classes, templates, etc ...",
+      "metadata": {}
     },
     {
       "id": "e5b116ce-ced1-4aa4-b14e-ef7d2606202e",
@@ -577,14 +573,30 @@
       "execution_count": 28
     },
     {
-      "id": "4557f440-c441-4f25-b461-9b4769f882a1",
+      "id": "73aa865d-f643-4b72-9701-f6e312914690",
+      "cell_type": "markdown",
+      "source": "# Taking input from the user",
+      "metadata": {}
+    },
+    {
+      "id": "6efd2bbc-525a-4659-9431-aefc819e8cb7",
+      "cell_type": "code",
+      "source": "std::string name;\nstd::cin >> name;",
+      "metadata": {
+        "trusted": true
+      },
+      "outputs": [],
+      "execution_count": null
+    },
+    {
+      "id": "8ec65830-4cb5-4d01-a860-f6c46ac4f60f",
       "cell_type": "code",
-      "source": "",
+      "source": "std::cout << \"Your name is \" << name;",
       "metadata": {
         "trusted": true
       },
       "outputs": [],
       "execution_count": null
     }
   ]
-}
+}

notebooks/xeus-cpp.ipynb

@@ -842,16 +842,37 @@
    ]
   },
   {
-   "cell_type": "code",
-   "execution_count": null,
-   "id": "8e61d038-c7a6-4796-a6c6-d70c34ecd724",
+   "cell_type": "markdown",
+   "id": "92b12afd-2dbd-41df-acd0-25171c6dbb0d",
    "metadata": {
     "vscode": {
      "languageId": "c++"
     }
    },
+   "source": [
+    "# Taking input from the user"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "e9a85de0-df46-4850-b88a-4b752f29c1a4",
+   "metadata": {},
    "outputs": [],
-   "source": []
+   "source": [
+    "std::string name;\n",
+    "std::cin >> name;"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "f95eece8-cd43-443e-8e27-9b901afefb20",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "std::cout << \"Your name is\" << name;"
+   ]
   }
  ],
  "metadata": {