feat: initial commitHEADmain

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diff --git a/chapter4/str_demo.cxx b/chapter4/str_demo.cxx
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+// FILE: str_demo.cxx

+// This is a small demonstration program showing how the string class is used.

+#include <iostream>     // Provides cout and cin

+#include <cstdlib>      // Provides EXIT_SUCCESS

+#include "mystring.h"   // Or use the Standard Library <string>

+using namespace std;

+using namespace main_savitch_4;

+

+// PROTOTYPES for functions used by this demonstration program:

+void match(const string& variety, const string& mine, const string& yours);

+// The two strings, mine and yours, are compared. If they are the same, then a 

+// message is printed saying they are the same; otherwise mine is printed

+// in a message. In either case, the string variety is part of the message.

+

+int main( )

+{

+    const string BLANK(" ");

+    string me_first("Demo"), me_last("Program");

+    string you_first, you_last, you;

+    

+    cout << "What is your first name? ";

+    cin >> you_first;

+    match("first name", me_first, you_first);

+    cout << "What is your last name? ";

+    cin >> you_last;

+    match("last name", me_last, you_last);

+

+    you = you_first + BLANK + you_last;

+    cout << "I am happy to meet you, " << you << "." << endl;

+    return EXIT_SUCCESS; 

+}

+

+void match(const string& variety, const string& mine, const string& yours)

+{

+    if (mine == yours)

+        cout << "That is the same as my " << variety << "!" << endl;

+    else

+        cout << "My " << variety << " is " << mine << "." << endl;

+}