diff --git a/main.cpp b/main.cpp
index db351ef..7d3799a 100644
--- a/main.cpp
+++ b/main.cpp
@@ -1,3 +1,5 @@
+#include <iostream>
+
 using namespace std;
 
 int main()
@@ -10,14 +12,31 @@ int main()
   {
     cout<<"Enter a whole number: \n";
     cin>>num1;
+
+    while (!(cin >> num1)) // <<< note use of "short circuit" logical operation here
+    {
+      cout << "Please enter the number " < endl;
+      cin.clear();
+      cin.ignore(); // NB: preferred method for flushing cin
+    }
+
+
     cout<<"Enter another whole number: \n";
     cin>>num2;
+    while (!(cin >> num2)) // <<< note use of "short circuit" logical operation here
+    {
+      cout << "Please enter the number " < endl;
+      cin.clear();
+      cin.ignore(); // NB: preferred method for flushing cin
+    }
 
-    if( num1 = num2 )
+    if( num1 == num2 )
     {
       cout<<"Numbers should be different!\n";
       repeat = true;
     }
+    else
+      repeat = false;
   }while(repeat);
 
   cout<<"Increasing order: ";
@@ -32,4 +51,3 @@ int main()
 
  return 0;
 }
-