Added some input validation examples

input1.cpp

@@ -0,0 +1,21 @@
+#include <iostream>
+using namespace std;
+
+/*
+  what happens if you enter a character? what happens if I enter 12.2?
+  how do I abstract this?
+*/
+
+int main() {
+  int ourInput;
+
+  cout << "Enter a whole number, only." << endl;
+  cin >> ourInput;
+  while(cin.fail()){
+    cout << "Nope, enter a number" << endl;
+    cin.clear();
+    cin.ignore(256,'\n');
+    cin >> ourInput;
+  }
+  return 0;
+}

input2.cpp

@@ -0,0 +1,31 @@
+/*
+  Now we're going to abstract the idea of checking whether a number is correct into its own function
+  
+  Otherwise this is going to be just like input1.cpp
+*/
+
+#include <iostream>
+using namespace std;
+
+int readInt(){
+  int ourInput;
+
+  cout << "Enter a whole number, only." << endl;
+  cin >> ourInput;
+  while(cin.fail()){
+    cout << "Nope, enter a number" << endl;
+    cin.clear();
+    cin.ignore(256,'\n');
+    cin >> ourInput;
+  }
+  cin.ignore(256,'\n'); // check what happens if you comment this line out and enter something like 10.3 as your first number, does it make sense why we need it?
+  return ourInput;
+}
+
+int main() {
+  int myInt = readInt();
+  int anotherInt = readInt();
+
+  cout << "Let's add our numbers together: " << myInt + anotherInt << endl;
+  return 0;
+}