Как в массиве структур найти нужную

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// control.cpp: определяет точку входа для консольного приложения.
//
 
#include "stdafx.h"
#include <iostream>
#include <fstream>
#include <Windows.h>
#include <string.h>
 
using namespace std;
const int NotUsed = system( "color F0" );
 
struct student
{
    char lastname[30];
    char firstname[30];
    char street[30];
             int house;
    int apartment;
}mas;
 
int _tmain(int argc, _TCHAR* argv[])
{
  int option = 0;
  while(option != -1) {
  cout<<endl<<"1 - Make 2 - Print 3 - Save 4 - Load 5 - Sort 6 - Find 0 - Exit"<<endl;
  cout<<"Input Num ";
  cin >> option;
  switch(option) {
           case 1:
   cout <<endl<<"Make"<<endl;
   int i;
   struct student mas[10];
   strcpy_s(mas[0].lastname, "Anisimov");
   strcpy_s(mas[0].firstname, "Anton");
   strcpy_s(mas[0].street, "Budanuva"); 
   mas[0].house=10;
   mas[0].apartment=3;
   strcpy_s(mas[1].lastname, "Bunin");
   strcpy_s(mas[1].firstname, "Pavel");
   strcpy_s(mas[1].street, "Oboronu"); 
   mas[1].house=20;
   mas[1].apartment=5;
   strcpy_s(mas[2].lastname, "Cuprin");
   strcpy_s(mas[2].firstname, "Vasiliy");
   strcpy_s(mas[2].street, "Lesnaay"); 
   mas[2].house=15;
   mas[2].apartment=8;
   strcpy_s(mas[3].lastname, "Dostoevskiy");
   strcpy_s(mas[3].firstname, "Igor");
   strcpy_s(mas[3].street, "Globova"); 
   mas[3].house=1;
   mas[3].apartment=15;
   strcpy_s(mas[4].lastname, "Esenin");
   strcpy_s(mas[4].firstname, "Evgeniy");
   strcpy_s(mas[4].street, "Respublikanskay"); 
   mas[4].house=56;
   mas[4].apartment=5;
   strcpy_s(mas[5].lastname, "Bach");
   strcpy_s(mas[5].firstname, "Anton");
   strcpy_s(mas[5].street, "Chmelnaay"); 
   mas[5].house=11;
   mas[5].apartment=88;
   strcpy_s(mas[6].lastname, "Pushkin");
   strcpy_s(mas[6].firstname, "Aleksandr");
   strcpy_s(mas[6].street, "Rechnaay"); 
   mas[6].house=132;
   mas[6].apartment=33;
   strcpy_s(mas[7].lastname, "Nosov");
   strcpy_s(mas[7].firstname, "Nikolay");
   strcpy_s(mas[7].street, "Treugolnaay"); 
   mas[7].house=16;
   mas[7].apartment=81;
   strcpy_s(mas[8].lastname, "Ostrovskiy");
   strcpy_s(mas[8].firstname, "Igor");
   strcpy_s(mas[8].street, "Komarskaay"); 
   mas[8].house=19;
   mas[8].apartment=8;
   strcpy_s(mas[9].lastname, "Asprin");
   strcpy_s(mas[9].firstname, "Robert");
   strcpy_s(mas[9].street, "Snezhnaay"); 
   mas[9].house=6;
   mas[9].apartment=24;
   for (i=0;i<10;i++)
   cout<<""<<mas[i].lastname<<" "<<mas[i].firstname<<" st. "<<mas[i].street<<" "<<mas[i].house<<", ap."<<mas[i].apartment<<endl;      
           break;
           case 2:
   cout <<endl<<"Print"<<endl;
   for(i=0;i<10;i++)
   cout<<""<<mas[i].lastname<<" "<<mas[i].firstname<<" st. "<<mas[i].street<<" "<<mas[i].house<<", ap."<<mas[i].apartment<<endl;
           break;
           case 3:
   cout <<endl<<"Save"<<endl;
   {
    ofstream outfile;
    outfile.open("outfile.txt");
    for (i=0;i<10;++i)
    outfile << mas[i].lastname << " " << mas[i].firstname << " st. " << mas[i].street << " " << mas[i].house << ", ap. " << mas[i].apartment <<endl;
    outfile.close();
   }
           break;
           case 4:
   cout <<endl<<"Load"<<endl;
   {char buff[100]; 
   ifstream fin("outfile.txt"); 
   for (i=0;i<10;i++)
   {
    fin.getline(buff, 100);
    cout << buff<<endl;
   }
   fin.close();
   }
           break;
           case 5:
   cout <<endl<<"Sort"<<endl;
   int j;
   char mas2[30];
   char mas3[30];
   char mas4[30];
   int mas5;
   int mas6;
   for(i=0;i<10-1;i++)
        for(j=i+1;j<10;j++)
            if(strcmp(mas[i].lastname,mas[j].lastname)>0)
            {strcpy_s(mas2,mas[i].lastname);
     strcpy_s(mas3,mas[i].firstname);
     strcpy_s(mas4,mas[i].street);
     swap(mas[i].house,mas5);
     swap(mas[i].apartment,mas6);
    
     strcpy_s(mas[i].lastname,mas[j].lastname);
     strcpy_s(mas[i].firstname,mas[j].firstname);
     strcpy_s(mas[i].street,mas[j].street);
     swap(mas[i].house,mas[j].house);
     swap(mas[i].apartment,mas[j].apartment);
 
              strcpy_s(mas[j].lastname,mas2);
     strcpy_s(mas[j].firstname,mas3);
     strcpy_s(mas[j].street,mas4);
     swap(mas[j].house,mas5);
     swap(mas[j].apartment,mas6);
             }
    for(i=0;i<10;i++)
    cout<<mas[i].lastname<<" "<<mas[i].firstname<<" st. "<<mas[i].street<<" "<<mas[i].house<<", ap."<<mas[i].apartment<<endl;
           break;
           case 6:
   cout <<endl<<"Find"<<endl;
 
           break;
           case 0: return 0;
           default:
  cout <<endl<<"Error"<<endl;
                             }
                          }
system("pause");
return 0;
}