****To run this code Succesfully****
create phone.txt file in home directory of ubuntu and then run this code
#include <iostream>
#include <fstream>
#include <cstring>
#include <iomanip>
using namespace std;
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;
}
int main(){
phoneBook rec;
fstream file;
file.open("phone.txt", ios::ate | ios::in | ios::out | ios::binary );
char c,ch,nm[20],telno[6];
int choice,cnt,found=0;
do{
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();
file.write((char *) &rec, sizeof(rec));
cout<<"Record Added Succesfully\n";
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();
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";
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";
break;
case 5 : //Update Telephone No.
cout<<"\n\nEnter Name : ";
cin>>nm;
file.seekg(0,ios::beg);
found=0;
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:
break;
}
cout<<"do you want to exit(y/n): ";
cin>>c;
}while(c=='n'||c=='N');
file.close();
}
