q18

/* Question Number 18: File I/O */
#include <fstream>
#include <iostream>
#include <cstring>
using namespace std;

int main ()
{
   int ch,flag=0,flag2;
   char data[50],src[50],phn[50];
   while (1)
   {
    cout<<"\nMenu\n1.Add\n2.Delete\n3.Search\n4.Save & Display\n5.Exit\nEnter your choice: ";
    cin>>ch;
    switch(ch)
    {
    case 1:
    {
        ofstream outfile;
            outfile.open("afile.txt",ios::app);
            cout << "\nEnter your name: ";
        cin.ignore();
            cin.getline(data,20);
            outfile << data << ' ';
            cout << "Enter your Phone: ";
        cin.ignore();
        cin.getline(phn,10);
                outfile<< phn << endl;
                outfile.close();
        break;
    }
    case 2:
    {
        ifstream infile("afile.txt");
            ofstream outfile("temp.txt");
            cout << "\nEnter name you want to erase from database: ";
        cin.ignore();
        cin.getline(src,20);
        while(infile>>data>>phn)
            {
                if(strcmp(data,src))
            {
                flag2=0;
                        outfile << data <<' '<< phn <<endl;
            }
                else
                    flag2=1;
            }
            infile.close();
            outfile.close();
            remove("afile.txt");
            rename("temp.txt","afile.txt");
            if(flag2==0)
                cout<<"There is no record with the name you entered"<<endl;
            else
                cout<<"Record has been deleted." << endl;
            break;
    }
    case 3:
    {
        ifstream infile;
        infile.open("afile.txt");
        cout<<"\nEnter name of person to be searched: ";
        cin.ignore();
        cin.getline(src,20);
        while(infile>>data>>phn)
        {
            if(strstr(data,src))
            {
                flag=1;
                break;
            }
            else
                flag=0;
        }
        if (flag==1)
        {
            cout<<"\nRecord found!!!";
            cout<<"Name: "<<data<<"\nPhone: "<<phn<<endl;
        }
        else
            cout<<"\nRecord not found";
        infile.close();
        break;
    }
    case 4:
    {
        ifstream infile;
        infile.open("afile.txt");
        while(infile>>data>>phn)
            cout<<"Name: "<<data<<"\nPhone: "<<phn<<endl;
        break;
    }
    //break;
    case 5: return 0;
    }
  }
  return 0;
}