Question

Write a menu-driven C++ program to manage a class roster of student names that can grow and shrink dynamically. It should work something like this (user input highlighted in blue): Array size: 0, capacity: 2 MENU A Add a student D Delete a student L List all students Q Quit ...your choice: a[ENTER] Enter the student name to add: Jonas-Gunnar Iversen[ENTER] Array size: 1, capacity: 2 MENU A Add a student D Delete a student L List all students Q Quit ...your choice: a[ENTER] Enter the student name to add: Marcela Nogueira[ENTER] Array size: 2, capacity: 2 MENU A Add a student D Delete a student L List all students Q Quit ...your choice: l[ENTER] Student Roster -------------- Jonas-Gunnar Iversen Marcela Nogueira Array size: 2, capacity: 2 MENU A Add a student D Delete a student L List all students Q Quit ...your choice: d[ENTER] Enter the student name to delete: Jonas-Gunnar Iversen[ENTER] Array size: 1, capacity: 2 MENU A Add a student D Delete a student L List all students Q Quit ...your choice: q[ENTER] Requirements Allow the menu options to be entered in either lower or upper case. Implement all the actions in the above menu -- add, delete and list. Use a dynamic array of strings to store the roster, with an initial capacity of 2. Double the array capacity when (a) you have a new student to add, and (b) size equals capacity. You do not need to shrink the array after deletes. The output table should have a column heading as shown above. Output the array size and capacity along with the output table. Hints You don't have to write functions for everything. You may just write code blocks in main, and if it makes sense for youto move any of them out of main and into functions (like a void function to cout a table of names), do so. Would the operations be best handled with a series of if/else statements, or a case/switch statement? There are some built-in string functions that convert to upper and lower case. What to Submit Submit your .cpp file and a screenshot of one run of the program that includes at least an "add" of a name and one "list" operation. Please answer with different person

Answer 1

CODE:

#include <iostream>
#include <stdlib.h>
#include <string.h>

using namespace std;

int main() {

    // Char double pointer array to save records;
    char **students_record = new char*[2];
    char choice;// choice
    int size = 0, capacity = 2;// capacity and size of array.
    int delcount = 0;// number of names deleted;
    bool quit = false;// variable to quit the program.
    string name;

    do {
        // display menu
        cout<<"ARRAY Size : "<<size-delcount<<" Capacity : "<<capacity<<endl
            <<"MENU\nA Add a student\nD Delete a student\nL List all students\nQ Quit\n...your choice : ";
        cin>>choice;
        switch(choice){
            case 'A':
            case 'a':
                cout<<"Enter the name of student to add : ";
                getline(cin, name);// To get the \n after the choice.
                getline(cin, name);// accept string with space;

                // if size is same as capacity then double the array using realloc.
                if(size == capacity) {
                    students_record = (char **)realloc(students_record, capacity * 2 *sizeof(*students_record));
                    capacity *= 2;
                }
                // copy students name.
                students_record[size] = new char[name.size()];
                strcpy(students_record[size],name.c_str());
                size++;
                break;
            case 'D':
            case 'd':
                cout<<"Enter the student name to delete: ";
                getline(cin, name);// accept \n after choice.
                getline(cin, name);// accept spaces

                for (int i = 0;i<size;i++) {
                    if(strcmp(name.c_str(),students_record[i])==0) {
                        // empty the deleted string when found.
                        strcpy(students_record[i],"");
                        // increase the delete count;
                        delcount++;
                    }
                }
                break;
            case 'L':
            case 'l':
                getline(cin, name);// accept the \n after choice
                cout<<"Student Roster\n---------------------\n";
                for (int i = 0; i< size; i++) {
                    // skip printing of records which are empty.
                    if(strcmp(students_record[i], "") != 0){
                        cout<<students_record[i]<<endl;
                    }
                }
                break;
            case 'Q':
            case 'q':
                // initialize quit to true for exiting the loop.
                quit = true;
                break;
        }
    }while(!quit);

    return 0;
}

OUTPUT