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//Telephone Directory

#include <iostream.h>
#include <fstream.h>
#include <string.h>
#include <iomanip.h>
#include <conio.h>

class phoneBook{
    char name[20],phno[15];
    public:
    void getdata();
    void showdata();
    char *getname(){ return name; }
    char *getphno(){ return phno; }
    void update(char *nm,char *telno){
        strcpy(name,nm);
        strcpy(phno,telno);
    }
};

void phoneBook :: getdata(){
    cout<<\"\\nEnter Name : \";
    cin>>name;
    cout<<\"Enter Phone No. : \";
    cin>>phno;
}

void phoneBook :: showdata(){
    cout<<\"\\n\";
    cout<<setw(20)<<name;
    cout<<setw(15)<<phno;
}


void main(){
    phoneBook rec;
    fstream file;
    file.open(\"d:\\\\phone.dat\", ios::ate | ios::in | ios::out | ios::binary);
    char ch,nm[20],telno[6];
    int choice,found=0;
    while(1){
        clrscr();
        cout<<\"\\n*****Phone Book*****\\n\";
        cout<<\"1) Add New Record\\n\";
        cout<<\"2) Display All Records\\n\";
        cout<<\"3) Search Telephone No.\\n\";
        cout<<\"4) Search Person Name\\n\";
        cout<<\"5) Update Telephone No.\\n\";
        cout<<\"6) Exit\\n\";
        cout<<\"Choose your choice : \";
        cin>>choice;
        switch(choice){
            case 1 : //New Record
                 rec.getdata();
                 cin.get(ch);
                 file.write((char *) &rec, sizeof(rec));
                 break;

            case 2 : //Display All Records
                 file.seekg(0,ios::beg);
                 cout<<\"\\n\\nRecords in Phone Book\\n\";
                 while(file){
                    file.read((char *) &rec, sizeof(rec));
                    if(!file.eof())
                        rec.showdata();
                 }
                 file.clear();
                 getch();
                 break;

            case 3 : //Search Tel. no. when person name is known.
                 cout<<\"\\n\\nEnter Name : \";
                 cin>>nm;
                 file.seekg(0,ios::beg);
                 found=0;
                 while(file.read((char *) &rec, sizeof(rec)))
                 {
                    if(strcmp(nm,rec.getname())==0)
                    {
                        found=1;
                        rec.showdata();
                    }
                 }
                 file.clear();
                 if(found==0)
                    cout<<\"\\n\\n---Record Not found---\\n\";
                 getch();
                 break;

            case 4 : //Search name on basis of tel. no
                 cout<<\"\\n\\nEnter Telephone No : \";
                 cin>>telno;
                 file.seekg(0,ios::beg);
                 found=0;
                 while(file.read((char *) &rec, sizeof(rec)))
                 {
                    if(strcmp(telno,rec.getphno())==0)
                    {
                        found=1;
                        rec.showdata();
                    }
                 }
                 file.clear();
                 if(found==0)
                    cout<<\"\\n\\n---Record Not found---\\n\";
                 getch();
                 break;

            case 5 : //Update Telephone No.
                 cout<<\"\\n\\nEnter Name : \";
                 cin>>nm;
                 file.seekg(0,ios::beg);
                 found=0;
                 int cnt=0;
                 while(file.read((char *) &rec, sizeof(rec)))
                 {
                    cnt++;
                    if(strcmp(nm,rec.getname())==0)
                    {
                        found=1;
                        break;
                    }
                 }
                 file.clear();
                 if(found==0)
                    cout<<\"\\n\\n---Record Not found---\\n\";
                 else
                 {
                    int location = (cnt-1) * sizeof(rec);
                    cin.get(ch);
                    if(file.eof())
                        file.clear();

                    cout<<\"Enter New Telephone No : \";
                    cin>>telno;
                    file.seekp(location);
                    rec.update(nm,telno);
                    file.write((char *) &rec, sizeof(rec));
                    file.flush();
                 }
                 break;
            case 6 : goto out;
        }
    }
out:
file.close();
}[/Code]

 
 
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