could you write description for this program.

#include  #include  #include  #include  // file stream #include  // cin, cout #include  #include  // STL sort() using namespace std; char menu(); // show user chocies void execute(const char command); // perform a user's choice void create_data(); void load_data(char const *fn); // load data from fn void display_data(); void save_data(char const *fn); // save data to file fn void about(); // menu choices const char ABOUT = '0'; // use characters it is safer for input const char CREATE_DATA = '1'; const char LOAD_DATA = '2'; const char DISPLAY_DATA = '3'; const char SHOW_DIRECTORY = '4'; const char SAVE_DATA = '5'; const char SORT_DATA = '6'; const char QUIT = 'Q'; const int N = 100; int myData[N]; // can hold 10 data items char const *filename = "myData.txt"; // default data file name int main() { char command; do { command = menu(); execute(command); system("pause"); } while (toupper(command) != QUIT); return 0; } char menu(){ char c; do { system("cls"); cout << "command menu "; cout << "0.....About "; cout << "1.....Create Data "; cout << "2.....Load Data "; cout << "3.....Display "; cout << "4.....Directory "; cout << "5.....Save Data "; cout << "6.....Sort Data "; cout << "Q.....Quit "; cout << "choice: "; cin >> c; } while ( !('0'<=c && c<='6') && c!='Q'); return c; } void execute(const char command) { switch (toupper(command)) { case ABOUT: about(); break; case CREATE_DATA: create_data(); break; case LOAD_DATA: load_data(filename); break; case SAVE_DATA: save_data(filename); break; case DISPLAY_DATA: display_data(); break; case SHOW_DIRECTORY: system("dir /a/p *.txt "); // only show files ending with txt break; case SORT_DATA: sort(myData, myData + N); // STL using default ordering break; } // end of switch statement } // end of execute function void about() { cout << " SAMPLE of menu driven programming "; cout << "(c) copyright 2011 your name. All rights reserved. "; } void create_data() { cout << "Generating data "; srand( time(NULL) ); // seed pseudo-random number generator for (int i = 0; i> myData[i]; } infile.close(); cout << "END Processing File" << endl; }