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diff --git a/chapter1/guess.cxx b/chapter1/guess.cxx
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+// FILE: guess.cxx
+// Demostrates a guessing game function that's used as a time analysis example.
+
+#include <cassert>         // Provides assert
+#include <iostream>        // Provides cout and cin
+#include <cstdlib>         // Provides EXIT_SUCCESS
+using namespace std;       // Allows all Standard Library items to be used
+
+// Prototype for the function used in this demonstration program
+void guess_game(int n);
+// Precondition: n > 0.
+// Postcondition: The user has been asked to think of a number between 1 and n.
+// The function asks a series of questions, until the number is found.
+
+
+int main( )
+{
+    guess_game(100);
+    return EXIT_SUCCESS;
+}
+
+void guess_game(int n)
+// Library facilities used: cassert, iostream
+{
+    int guess;
+    char answer;
+
+    assert(n >= 1);
+
+    cout << "Think of a whole number from 1 to " << n << "." << endl;
+    answer = 'N';
+    for (guess = n; (guess > 0) && (answer != 'Y') && (answer != 'y'); --guess)
+    {
+        cout << "Is your number " << guess << "?" << endl;
+        cout << "Please answer Y or N, and press return: ";
+        cin >> answer;
+    }
+
+    if ((answer == 'Y') || (answer == 'y'))
+        cout << "I knew it all along." << endl;
+    else
+        cout << "I think you are cheating!" << endl;
+}