Program to perform updation of a data file for mainipulating an address book

//Program to perform updation of a data file
// for mainipulating an address book

#include<stdio.h>
#include<stdlib.h>
#include<fstream.h>
#include<string.h>
#include<conio.h>
#define ENTER 13
#define BACK 8


struct student
{
  char name[30];
  char proff[40];
  char address[20];
  char country[20];
  char tel[20];
  char fax[20];
  char mobile[20];
  char email[50];
};

class data
{
private:
  student std;
  int j,count;
  char sname[50],pass[10],c;
public:
  struct student getData();
  void showData(struct student);
  void saveData();
  int readData();
  void delet();
  void modify();
  void searchData();
  void emergency();
  void password();
  int checkpass();
  void modpass();
  char* takepass();
  int checkvalidity(char []);
};

student data::getData()
{
 cout<<"Name          : ";
 gets(std.name);
 cout<<"Proffession   : ";
 gets(std.proff);
 cout<<"Address       : ";
 gets(std.address);
 cout<<"Country       : ";
 gets(std.country);
 cout<<"Telephone     : ";
 gets(std.tel);
 cout<<"Fax           : ";
 gets(std.fax);
 cout<<"Mobile        : ";
 gets(std.mobile);
 cout<<"E.mail        : ";
 gets(std.email);
}
void data:: showData(student str)
{
clrscr();
cout<<"\nName         : "<<str.name;
cout<<"\nProffession  : "<<str.proff;
cout<<"\nAddress      : "<<str.address;
cout<<"\nCountry      : "<<str.country;
cout<<"\nTelephone    : "<<str.tel;
cout<<"\nFax          : "<<str.fax;
cout<<"\nMobile       : "<<str.mobile;
cout<<"\nE.mail       : "<<str.email;
getch();
}
void data::modify()
{
char dname[30];
int l;
int coutn=0,choice;
int k=0;
l=checkpass();
if(l==1)
{
cout<<"\nPlease mention the name to be modified : ";
cin>>dname;
fstream infile;
infile.open("tata.Dat",ios::in|ios::out);
infile.seekg(0);
if(infile)
{
while(infile.read((char *)&std,sizeof(student)))
{
   coutn++;
   char ans='y';
   if(stricmp(std.name,dname)==0)
   {
   k=1;
   while(ans=='y'||ans=='Y')
   {
   clrscr();
   cout<<"What do you want to modify\n1.Name\n2.Proffession\n3.Address ";
   cout<<"\n4.Country\n5.Telephone Number\n6.Fax Number\n7.Mobile";
   cout<<"\n8.E-mail\t";
   cin>>choice;
   switch(choice)
   {
 case 1:
cout<<"Name          : ";
cin>>std.name;
break;
 case 2:
cout<<"Proffession   : ";
cin>>std.proff;
break;
 case 3:
cout<<"Address       : ";
cin>>std.address;
break;
 case 4:
cout<<"Country       : ";
cin>>std.country;
break;
 case 5:
cout<<"Telephone     : ";
cin>>std.tel;
break;
 case 6:
cout<<"Fax           : ";
cin>>std.fax;
break;
 case 7:
cout<<"Mobile        : ";
cin>>std.mobile;
break;
 case 8:
cout<<"E-mail        : ";
cin>>std.email;
break;
 default:
cout<<"Wrong choice ";
break;
   }
   cout<<"\nAnything More to modify ";
   cin>>ans;
         }
   infile.seekp((coutn-1)*sizeof(student));
   infile.write((char *)&std,sizeof(student));
   }
}
if(k!=1)
   cout<<"The name doesn't exist ";
else
   cout<<"The name has been successfully modified ";
}
}
else
   cout<<"access denied ";
   getch();
}
void data::delet()
{
char dname[30];
int coutn=0;
int k=0;
if(checkpass()==1)
{
cout<<"\n\nPlease mention the name to be deleted : ";
gets(dname);
fstream infile;
infile.open("tata.Dat",ios::in|ios::out);
infile.seekg(0);
if(infile)
{
while(infile.read((char *)&std,sizeof(student)))
{
   coutn++;
   if(stricmp(std.name,dname)==0)
   {
   k=1;
   strcpy(std.name," ");
   strcpy(std.proff," ");
   strcpy(std.address," ");
   strcpy(std.country," ");
   strcpy(std.tel," ");
   strcpy(std.fax," ");
   strcpy(std.mobile," ");
   strcpy(std.email," ");
   infile.seekp((coutn-1)*sizeof(student));
   infile.write((char *)&std,sizeof(student));
   break;
   }
}
if(k!=1)
   cout<<"The name doesn't exist ";
else
   cout<<"The name has been successfully deleted ";
}
}
else
   cout<<"\n\nAccess Denied ";
getch();
}

void data:: saveData()
{
ofstream outfile;
outfile.open("tata.Dat",ios::app);
outfile.write( (char *)&std,sizeof(student));
}
int data::readData()
{
count=0;
ifstream infile;
infile.open("tata.Dat",ios::app);
if(infile)
{
while(infile.read((char *)&std,sizeof(student)))
{
   if(strcmp(std.name," ")!=0)
   showData(std);
   count++;
}
}
else
cout<<"no file";
return(count);
}
void data::emergency()
{
char emer[30];
int j=0;
cout<<"Please type the name to be searched: ";
gets(emer);
ifstream infile;
infile.open("tata.Dat",ios::nocreate);
while(infile.read((char *)&std,sizeof(student)))
{
if(stricmp(emer,std.proff)==0)
{
j=1;
showData(std);
}
}
if(j==0)
cout<<"Sorry the name doesn't exist";
getch();
}
void data::searchData()
{
j=0;
cout<<"Please type the name to be searched: ";
gets(sname);
ifstream infile;
infile.open("tata.Dat",ios::nocreate);
while(infile.read((char *)&std,sizeof(student)))
{
if(stricmp(sname,std.name)==0)
{
j=1;
showData(std);
}
}
if(j==0)
cout<<"Sorry the name doesn't exist";
}
void data::password()
{
char fre[20];
int pd;
clrscr();
cout<<endl<<endl<<"Password ";
strcpy(fre,takepass());
pd=checkvalidity(fre);
clrscr();
if(pd==1)
cout<<"This password already exist Please try for new password ";
else
{
strcpy(pass,fre);
ofstream passfile;
passfile.open("pass.dat",ios::app);
passfile.write(pass,sizeof(pass));
cout<<"Passwords are sensitive do not lend it ";
}
}
int data::checkvalidity(char fre[])
{
int idm=0;
ifstream passfile;
passfile.open("pass.dat",ios::app);
while(passfile.read(pass,sizeof(pass)))
{
   if(stricmp(fre,pass)==0)
   {
idm=1;
break;
   }
}
return idm;
}


void data::modpass()
{
  char d[20],npass[20];
  clrscr();
  int me=0,in=0;
  cout<<endl<<endl<<"Old Password ";
  strcpy(d,takepass());

  fstream infile;
  infile.open("pass.dat",ios::out|ios::in);
  {
 while(infile.read(pass,sizeof(pass)))
 {
me++;
if(strcmp(d,pass)==0)
{
   in=1;
   cout<<"\nOK the password exist ";
   getch();
clrscr();
cout<<endl<<endl<<"New password ";
   strcpy(pass,takepass());
infile.seekp((me-1)*sizeof(pass));
   infile.write(pass,sizeof(pass));
}
 }
  }
  if(in==0)
   cout<<"\nThe password doesn't exist ";
  else
   cout<<"\nThe password has been successfully modified ";
   getch();
}

int data::checkpass()
{
char da[20];
int z=0,to=0,u=0;
clrscr();
ifstream passfile;
passfile.open("pass.dat",ios::app);
while(to<1&&z!=1)
{
to++;
cout<<endl<<endl<<"Your password ";
strcpy(da,takepass());
passfile.seekg(0);
while(passfile.read(pass,sizeof(pass)))
{
clrscr();
if(strcmp(da,pass)==0)
{
   z=1;
   break;

}
}
}
return z;
}
char* data::takepass()
{
 char ma[20],pa[20];
int q=0,row=30,col=3;
int i=0;
gotoxy(30,3);
while((c=getch())!=ENTER)
{

if(c==BACK)
{
  gotoxy((row-1),col);
  cout<<" ";
  row--;
  i--;
}
else
{
  ma[i]=c;
  i++;
  gotoxy(row,col);
  cout<<"*";
  row++;
}
}
ma[i]='\0';
strcpy(pa,ma);
  clrscr();
return pa;
}
void main()
{
clrscr();//Clearing the screen.
int ch,i,k,a;
char choice,sm[20];
data s;
      srand(time(NULL));
a=1+(rand()%100);
      textcolor(WHITE);
while(1)
{
   clrscr();
   cout<<"Your Choices";
   cout<<"\n1.Enter datas\n2.Read From File\n3.Search data\n4.ModifyData\n5.DeleteData\n6.View Emergency Contacts\t";
   cout<<"\n7.Create New Password\n8.Modify Password\n9.Exit\t";
   cin>>ch;
   switch(ch)
   {
case 1:
cout<<"How many datas do u want to feed " ;
cin>>i;
for(k=0;k<i;k++)
{
   s.getData( );
   s.saveData();
}
break;
case 2:
s.readData();
getch();
break;
case 3:
s.searchData();
getch();
break;
case 4:
s.modify();
break;
case 5:
s.delet();
break;
case 9:
exit(0);
case 7:
cout<<"Please mention Your institution ";
cin>>sm;
if((strcmpi(sm,"spsl")==0)&&(a%4==0))
s.password();
else
if((strcmpi(sm,"spsl")==0)&&(a%4!=0))
{
clrscr();

textcolor(LIGHTRED+BLINK);
      gotoxy(25,10);
cout<<"Sorry the system is busy";
}
else
{
 clrscr();
gotoxy(25,10);
 textcolor(LIGHTRED+BLINK);
 cout<<"\nYOU ARE NOT THE LEGAL PERSON ";
}
 getch();
textcolor(WHITE);
break;
case 8:
s.modpass();
break;
case 6:
s.emergency();
break;
default:
cout<<"\nWrong Choice ";
getch();
   }
}
getch();
}