Creating a Library management system in C++ and database in SQL

#include<iostream>
#include<vector>
#include<fstream>
#include "Library.h"
#include "sqlite3.h"

void Library::ManageCheckout()
{
    control = 1;

    while(control != 4)
    {
        cout << endl << "What would you like to do?" << endl;
        cout << "1 - Show checkouts" << endl;
        cout << "2 - Check-out material" << endl;
        cout << "3 - Check-in material" << endl;
        cout << "4 - Return to main menu" << endl;
        cout << "-->";
        cin >> control;

        while(control < 1 || control > 4)
        {
            cout << "Incorrect input, try again" << endl << "-->";
            cin >> control;
        }

        switch(control)
        {
            case 1:
                PrintCheckouts();
                break;
            case 2:
                checkOut();
                break;
            case 3:
                checkIn();
                break;
            case 4:
                break;
        }
    }
}

void Library::PrintCheckouts()
{
    //Typical select statement layout, it can all go in one line if you want
    cout << sqlite3_exec(db, //<-- created in Library.cpp after libraries are included, links the program to the database
              "select * from Checkout;", //<-- Select statement goes here
              NULL, //Always put these next three arguments in when issuing an SQL command
              0,
              NULL);
}

/*void Library::BookCheckout()
{*/
    //Prompt user for data
     bool checkOut( const std::vector<ManagePatrons>& vecPatrons, const std::vector<ManageMaterials>& vecMaterials, std::vector<checkOut>& vecChecked ){
     Patron patronOut;
     Material materialOut;
     bool success = false;
     std::string strDate = "";

     // Get the patron.
     patronOut = selectPatron( vecPatrons );

     // Get the material.
     materialOut = selectMaterial( vecMaterials );

     // Get the due date.
     do{const std::vector<Patron>& vecPatrons, const std::vector<Material>& vecMaterials, std::vector<CheckedOut>& vecChecked
          std::cout << "Enter the due date (mm/dd/yyyy): ";
          cin >> strDate;

          if( strDate.length() < 10 ){
              // Alert user.
              std::cout << "Error!  Invalid date format." << endl;
          } else {
                 success = true;
          }
     } while( !success );

     // Add this item to the list of checked out items.
     vecChecked.push_back( CheckedOut( patronOut.getID(), materialOut.getTitle(), strDate ) );

     return success;
    //Enter data into Header file

    //Insert data into database
}

/*void Library::BookCheckin()
{*/
    //Ask what book was checked out
    bool checkIn( const std::vector<Patron>& vecPatrons, std::vector<CheckedOut>& vecChecked ){
     bool success = false;

       // Function variables...
       static const int LIST_SIZE = 10;
       int offset = 0;
       int selection = -1;
       char cSelect = ' ';
       bool valid = false;
       bool found = false;

       do{
              std::cout << "Make a selection from the menu below: " << endl << endl;

              // Print the specified number of entries.
              for( int menuCnt = 0; menuCnt < LIST_SIZE && menuCnt+offset < vecChecked.size(); ++menuCnt ){
                   // Print out each line selection option.
                   cout << menuCnt+1 << ".\t";

                   // Find and print the patron's name.
                   for(std::vector<Patron>::const_iterator iter_patron = vecPatrons.begin(); iter_patron < vecPatrons.end() && !found ; ++iter_patron ){
                         found = (iter_patron->getID() == vecChecked[offset+menuCnt].getPatronID() );

                         if( found ){
                             cout << iter_patron->getName().toStr();
                         }
                   }

                   std::cout << "\t" << vecChecked[offset+menuCnt].getMaterial() << "\t" << vecChecked[offset+menuCnt].getDueDate() << endl;
              }

              if( offset > 0 ){
                  std::cout << "\t\t p for previous page";
              }

              if( offset < (int) vecChecked.size() - LIST_SIZE ){
                  std::cout << "\t\t n for next page";
              }

              std::cout << endl << endl << "Enter selection: ";
              cin.ignore(1);    // Ignore previous return stroke.
              cin >> cSelect;

              switch( cSelect ){
                      case 'p':
                      case 'P':
                           if( offset > 0 ){
                                                      offset -= LIST_SIZE;
                           }
                           break;
                      case 'n':
                      case 'N':
                           if( offset < (int) vecPatrons.size() - LIST_SIZE ){
                                                      offset += LIST_SIZE;
                           }
                           break;
                      default:
                           selection = (int) cSelect - 49;
                           if( selection < 0 || selection > 9 ){
                               // Alert user.
                               std::cout << "Error!  Invalid selection attempted." << endl << endl;
                           } else {
                                  // Set flag for a valid entry.
                                  selection += offset;
                                  valid = true;
                           }
              }
       }while( !valid );

       // Remove the selected checked material from the vector.
       vecChecked.erase( vecChecked.begin() + selection );

     return success;
}

Codeblocks tells me that line 70 has impromper declarations and incompatible types. then it also says my atoi function is not properly declared. I have tried getting assistance from my instructor however she says she is lost by my code and doesn't know how to help me. I have also tried googling to look for references and help but haven't had any luck thus far.