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i was working on a project.

#include<iostream.h>

#include<conio.h>

void main()

{

int date();

int d;

int data;

cout<<"enter the date";

cin>>d;

data=date();

getch();

}

date(int d)

{ static int f=1;

if(d>31)

{

cout<<"enter a valid date";

date(d);

}

return f;

}

 

please help me run this program.

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- You can use the [ code] <code here> [ /code] brackets to make the code more readable:

#include <iostream> // for text input and output

using namespace std; // std::cout -> cout
int main() {
 // Ask user to guess a number.
 cout<<"Enter a guess for the number of errors in your code: ";
 int errors;
 cin>>errors;

 // React on ridiculous guesses.
 if (errors==0)
   cout<<"You wish!"<<endl;
}

- You should comment your code; you did not even say what it is supposed to do (my example did not either - because it is silly).

- Start with the snippet I gave you and replace parts of my code with yours. Your code is so erroneous I don't think it is worth keeping.

- Utter-newbie tip: Compile early, compile often. If two new lines make the previously-compiling code fail, it must be related to those two lines.

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code:

#include<iostream.h>
#include<conio.h>
void main()
{
int date();
int d;
int data;
cout<<"enter the date";
cin>>d;
data=date();
getch();
}
date(int d)
{ static int f=1;
if(d>31)
{
cout<<"enter a valid date";
date(d);
}
return f;
}

i wanted that function date should be called again and again until and unless proper condition is saticified.

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I don't really see why you did not follow my advice. Even if I had the Windows-only file conio.h installed on my system I really doubt your code would even compile; lines like "int date();" in a source block just seem wrong to me. Even if your code did compile you should at least see warnings like the one that tells you you should include <iostream> instead of <iostream.h>. And I still think you should comment each step your program is supposed to do. While it seems clear to me that the mentioned "int date();" should not compile you probably had a reason to add that line but it is absolutely unclear why you thought it should be there and what you wanted to achieve with this line.

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  • 2 weeks later...

my complete program now works(though i worked on it in tits and bits!)

#include<iostream.h>
#include<conio.h>
#include<stdio.h>
#include<process.h>
#include<fstream.h>
#include<string.h>
int ad=0,ch=0,a2,flight,flag=0,tage,tticketno=200;
char tname[30];
class airline
{
 char name[30];
 int age;
 unsigned long int basic,fuel,travelling,total;
 char flightname[30],flightno[30];
 char orgin[30],destination[30],tclass[20];

 public:
   int dd,mm,yyyy,ticketno;
   void datainput();
   void dataprocessing();
   void datadisplay();
   void menu();
   void findlastticketno();
   void ticketcancel();
} item;

struct date
{
 int day_no;
 int month;
 int year;
} d1;

void airline::menu()
{
 clrscr();
 cout<<"WELCOME TO CIS RESERVATION CENTER\n";
 cout<<"\n MENU\n";
 cout<<"1: TICKET BOOKING\n";
 cout<<"2: TICKET PRINTING\n";
 cout<<"3. TICKET CANCELLING\n";
 cout<<"4: EXIT\n";
}

class flight
{
 public:
   void routes();
   void available();
   void domestic();
   void dateflagchecking();
   void feeclass();
} f1;

void flight::routes()
{
 cout<<"\n";
 cout<<"Ticket Booking\n";
 cout<<"Available Destinations\n";
 cout<<"1 : INDIA TO BANGKOK"   <<"\t"<<"11: INDIA TO LONDON"      <<"\n";
 cout<<"2 : INDIA TO DUBAI"     <<"\t"<<"12: NEW YORK TO INDIA"   <<"\n";
 cout<<"3 : DELHI TO MUMBAI "   <<"\t"<<"13: HYDERABAD TO CHENNAI"<<"\n";
 cout<<"4 : BANGKOK TO INDIA"   <<"\t"<<"14: CHENNAI TO MUMBAI"   <<"\n";
 cout<<"5 : MALAYSIA TO INDIAt" <<"\t"<<"15: DELHI TO CHENNAI"    <<"\n";
 cout<<"6 : INDIA TO NEW YORK"  <<"\t"<<"16: CHENNAI TO HYDERABAD"<<"\n";
 cout<<"7 : MUMBAI TO CHENNAI"  <<"\t"<<"17: INDIA TO MALAYSIA"   <<"\n";
 cout<<"8 : DUBAI TO INDIA"     <<"\t"<<"18: HYDERABAD TO MUMBAI" <<"\n";
 cout<<"9 : MUMBAI TO HYDERABAD"<<"\t"<<"19: CHENNAI TO DELHI"    <<"\n";
 cout<<"10: MUMBAI TO DELHI"    <<"\t"<<"20: LONDON TO INDIA"     <<"\n";
}

void flight::available()
{
 cout<<"FLIGHTS AVAILABLE FOR INTERNATIONAL DESTINATIONS\n";

 cout<<"Flight Name"   <<"\t"<<"Flight NO."<<"\n";
 cout<<"1: Air India"  <<"\t"<<"AI 2535"   <<"\n";
 cout<<"2: JetAirways" <<"\t"<<"JA 4685"   <<"\n";
 cout<<"3: Kingfisher" <<"\t"<<"KF 2498"   <<"\n";
 cout<<"4: AirIndia"   <<"\t"<<"AI 0787"   <<"\n";
 cout<<"5: KIngfisher" <<"\t"<<"KF 3245"   <<"\n";
 cout<<"6: Jet Airways"<<"\t"<<"JA 1868"   <<"\n";
}

void flight::domestic()
{
 cout<<"FLIGHTS AVAILABLE FOR DOMESTIC DESTINATIONS\n";

 cout<<"Flight Name"         <<"\t"<<"Flight NO."<<"\n";
 cout<<"1: Indian Airlines"  <<"\t"<<"IA 2538"   <<"\n";
 cout<<"2: Spicejet"         <<"\t"<<"SJ 5736"   <<"\n";
 cout<<"3: JetAirways"       <<"\t"<<"JA 4485"   <<"\n";
 cout<<"4: Kingfisher"       <<"\t"<<"KF 8498"   <<"\n";
 cout<<"5: Air Deccan"       <<"\t"<<"AD 3517"   <<"\n";
 cout<<"6: Indian Airlines"  <<"\t"<<"IA 0797"   <<"\n";
 cout<<"7: KIngfisher"       <<"\t"<<"KF 3545"   <<"\n";
 cout<<"8: Air Deccan"       <<"\t"<<"AD 1379"   <<"\n";
 cout<<"9: Jet Airways"      <<"\t"<<"JA 1808"   <<"\n";
 cout<<"10:Spicejet"         <<"\t"<<"SJ 2564"   <<"\n";
}

void flight::feeclass()
{
 cout<<"Please enter in class which do you want to sit\n";

 cout<<"1: First Class\n";
 cout<<"2: Economy Class\n";
 cout<<"3: Executive class\n";
}

void flight::dateflagchecking()
{
do
 {
 flag=0;
 cout<<"Please enter the date you are  boarding the plane\n";

 cout<<"Date"<<"\t";
 cin>>d1.day_no;
 if(d1.day_no<=31)
 {
   cout<<"\n";
   cout<<"Month"<<"\t";
   cin>>d1.month;
   if(d1.month<=12)
   {
     cout<<"\n";
     cout<<"Year"<<"\t";
     cin>>d1.year;
     if(d1.year==2008)
     {
flag=1;
item.dd=d1.day_no;
item.mm=d1.month;
item.yyyy=d1.year;
     }
     }
     }
else
     {
flag=0;
cout<<"\nInvalid Date ... \nRetry again...";
}
}

while(flag!=1);
}

void airline::datainput()
{

 if (flag==1)
 {
   cout<<"\nName    ";
   gets(tname);
   cout<<"\nAge     ";
   cin>>tage;
   strcpy(item.name,tname);
   item.age=tage;
 }
}

void airline::dataprocessing()
{
 int c;

 basic=0;
 fuel=0;
 travelling=0;
 total=0;
 strcpy(flightname,"");
 strcpy(flightno,"");
 strcpy(orgin,"");
 strcpy(destination,"");

  if(a2==1||a2==2||a2==4||a2==5||a2==6||a2==8||a2==11||a2==12||a2==17||a2==20)

 {
   f1.available();
   cout<<"Please enter your choice\n";
   cin>>flight;
   if (flight==1) strcpy(flightname," Air India"), strcpy(flightno,"AI 2535");
   if (flight==2) strcpy(flightname," JetAirways"), strcpy(flightno,"JA 4685");
   if (flight==3) strcpy(flightname," Kingfisher"), strcpy(flightno,"KF 2498");
   if (flight==4) strcpy(flightname," AirIndia"), strcpy(flightno,"AI 0787");
   if (flight==5) strcpy(flightname," Kingfisher"), strcpy(flightno,"KF 3245");
   if (flight==6) strcpy(flightname," Jet Airways"), strcpy(flightno,"JA 1868");

   f1.feeclass();
   cout<<"Please enter your choice\n";
   cin>>c;
   if (c==1) strcpy(tclass,"First");
   if (c==2) strcpy(tclass,"Economy");
   if (c==3) strcpy(tclass,"Executive");
   switch(c)
   {
     case 1:
     if(a2==1||a2==4)
fuel=18000;
     else if(a2==2||a2==8)
fuel=16000;
     else if(a2==5||a2==17)
fuel=14000;
     else if(a2==6||a2==12)
fuel=32000;
     else if(a2==11||a2==20)
fuel=26000;
     basic=12000;
     cout<<"\nTotal Cost=\n";
     cout<<"\nBasic Fare="<<basic;
     cout<<"\nFuel charges=Rs"<<fuel;
     travelling=15000;
     cout<<"\nTravelling Charges="<<travelling;
     total=12000+15000+fuel+(8000*ad)+(5000*ch);
     cout<<"\nTotal Charges = Rs."<<total;
     break;

     case 2:
     if(a2==1||a2==4)
fuel=20000;
     else if(a2==2||a2==8)
fuel=18000;
     else if(a2==5||a2==17)
fuel=16000;
     else if(a2==6||a2==12)
fuel=34000;
     else if(a2==11||a2==20)
fuel=28000;
     cout<<"\nTotal Cost=\n";
     basic=14000;
     cout<<"\nBasic Fare=Rs"<<basic;
     cout<<"\nFuel charges=Rs";
     cout<<fuel;
     travelling=17000;
     cout<<"\nTravelling Charges=Rs."<<travelling;
     total=14000+17000+fuel+(10000*ad)+(7000*ch);
     cout<<"\nTotal Charges = Rs."<<total;
     break;

     case 3:
     if(a2==1||a2==4)
fuel=22000;
     else if(a2==2||a2==8)
fuel=20000;
     else if(a2==5||a2==17)
fuel=18000;
     else if(a2==6||a2==12)
fuel=36000;
     else if(a2==11||a2==20)
fuel=30000;
     cout<<"\nTotal Cost\n";
     basic=16000;
     cout<<"\nBasic Fare=Rs "<<basic;
     cout<<"\nFuel charges=Rs "<<fuel;
     travelling=19000;
     cout<<"\nTravelling Charges=Rs."<<travelling;
     total=16000+19000+fuel+(12000*ad)+(9000*ch);
     cout<<"\nTotal Charges = Rs."<<total;
     break;
   }
 }
 else
 {
   f1.domestic();
   cout<<"\nPlease enter your choice ";
   cin>>flight;

   if (flight==1) strcpy(flightname,"Indian Airlines"), strcpy(flightno,"IA 2538");
   if (flight==2) strcpy(flightname,"2: Spicejet"), strcpy(flightno, "SJ 5736");
   if (flight==3) strcpy(flightname,"3: JetAirways"), strcpy(flightno, "JA 4485");
   if (flight==4) strcpy(flightname,"4: Kingfisher"), strcpy(flightno, "KF 8498");
   if (flight==5) strcpy(flightname,"5: Air Deccan"), strcpy(flightno, "AD 3517");
   if (flight==6) strcpy(flightname,"6: Indian Airlines"), strcpy(flightno, "IA 0797");
   if (flight==7) strcpy(flightname,"7: KIngfisher"), strcpy(flightno, "KF 3545");
   if (flight==8) strcpy(flightname,"8: Air Deccan"), strcpy(flightno, "AD 1379");
   if (flight==9) strcpy(flightname,"9: Jet Airways"), strcpy(flightno, "JA 1808");
   if (flight==10) strcpy(flightname,"10:Spicejet"), strcpy(flightno, "SJ 2564");

   f1.feeclass();
   cout<<"\nPlease enter your choice\n";
   cin>>c;
   if (c==1) strcpy(tclass,"First");
   if (c==2) strcpy(tclass,"Economy");
   if (c==3) strcpy(tclass,"Executive");

   switch(c)
   {
     case 1:
     if(a2==3||a2==10)
fuel=1800;
     else if(a2==7||a2==14)
fuel=1600;
     else if(a2==9||a2==18)
fuel=1400;
     else if(a2==13||a2==16)
fuel=3200;
     else if(a2==15||a2==19)
fuel=2600;
     cout<<"\nTotal Cost\n";
     basic=1200;
     cout<<"\nBasic Fare=Rs "<<basic;
     cout<<"\nFuel charges=Rs "<<fuel;
     travelling=1500;
     cout<<"\nTravelling Charges=Rs "<<travelling;
     total=1200+1500+fuel+(800*ad)+(500*ch);
     cout<<"\nTotal Charges = Rs."<<total;
     break;

     case 2:
     if(a2==3||a2==10)
fuel=2000;
     else if(a2==7||a2==14)
fuel=1800;
     else if(a2==9||a2==18)
fuel=1600;
     else if(a2==13||a2==16)
fuel=3400;
     else if(a2==15||a2==19)
fuel=2800;
     cout<<"\nTotal Cost=\n";
     basic=1400;
     cout<<"\nBasic Fare=Rs "<<basic;
     cout<<"\nFuel charges=Rs "<<fuel;
     travelling=1700;
     cout<<"\nTravelling Charges=Rs "<<travelling;
     total=1400+1700+fuel+(1000*ad)+(700*ch);
     cout<<"\nTotal Charges = Rs."<<total;
     break;

     case 3:
     if(a2==3||a2==10)
fuel=2200;
     else if(a2==7||a2==14)
fuel=2000;
     else if(a2==9||a2==18)
fuel=1800;
     else if(a2==13||a2==16)
fuel=3600;
     else if(a2==15||a2==19)
fuel=3000;
     cout<<"\nTotal Cost=\n";
     basic=1600;
     cout<<"\nBasic Fare=Rs "<<basic;
     cout<<"\nFuel charges=Rs "<<fuel;
     travelling=1900;
     cout<<"\nTravelling Charges=Rs "<<travelling;
     total=1600+1900+fuel+(1200*ad)+(900*ch);
     cout<<"\nTotal Charges = Rs."<<total;
     break;
   }
 }
 if (a2==1) strcpy(orgin,": INDIA"), strcpy(destination,"BANGKOK");
 if (a2==11) strcpy(orgin,": INDIA"), strcpy(destination,"LONDON");
 if (a2==2) strcpy(orgin,": INDIA"), strcpy(destination,"DUBAI");
 if (a2==12) strcpy(orgin,": NEW YORK"),strcpy(destination,"INDIA");
 if (a2==3) strcpy(orgin,": DELHI"), strcpy(destination,"MUMBAI ");
 if (a2==13) strcpy(orgin,": HYDERABAD"),strcpy(destination,"CHENNAI");
 if (a2==4) strcpy(orgin,": BANGKOK"),strcpy(destination,"INDIA");
 if (a2==14) strcpy(orgin,": CHENNAI"),strcpy(destination,"MUMBAI");
 if (a2==5) strcpy(orgin,": MALAYSIA"),strcpy(destination,"INDIA");
 if (a2==15) strcpy(orgin,": DELHI"),strcpy(destination,"CHENNAI");
 if (a2==6) strcpy(orgin,": INDIA"),strcpy(destination,"NEW YORK");
 if (a2==16) strcpy(orgin,": CHENNAI"),strcpy(destination,"HYDERABAD");
 if (a2==7) strcpy(orgin,": MUMBAI"),strcpy(destination,"CHENNAI");
 if (a2==17) strcpy(orgin,": INDIA"),strcpy(destination, "MALAYSIA");
 if (a2==8) strcpy(orgin,": DUBAI"),strcpy(destination,  "INDIA");
 if (a2==18) strcpy(orgin,": HYDERABAD"),strcpy(destination, " MUMBAI");
 if (a2==9) strcpy(orgin,": MUMBAI "),strcpy(destination, "HYDERABAD");
 if (a2==19) strcpy(orgin,": CHENNAI"),strcpy(destination, "DELHI");
 if (a2==10) strcpy(orgin,": MUMBAI"),strcpy(destination, "DELHI");
 if (a2==20) strcpy(orgin,": LONDON"),strcpy(destination, "INDIA");
 ticketno++;
 item.ticketno=ticketno;
}

void airline::datadisplay()
{
 int p;
 cout<<"\n-------------------------------------------------------";
 cout<<"\nticket no."<<"\t"<<ticketno;

 cout<<"\nFlight name: "<<flightname;
 cout<<"\tFlight no. : "<<flightno;

 cout<<"\nOrigin: "<<orgin;
 cout<<"\tDestination: "<<destination;

 cout<<"\nName :"<<name;
 cout<<"\tAge  :"<<age;

 cout<<"\nday "<<dd;
 cout<<" month "<<mm;
 cout<<" year  "<<yyyy;
 cout<<" --- Class "<<tclass;

 cout<<"\nBasic Rs. "<<item.basic;
 cout<<"\tFuel Rs. "<<item.fuel;
 cout<<"\tTravelling Rs. "<<item.travelling;
 cout<<"\tTotal Rs. "<<item.total;
 cout<<"\n**Happy Journey**(Note:Charges depend on Class in which U Travel:-)";
 tage=item.age;

}

void airline::findlastticketno()
{
 fstream filfltn;
 filfltn.open("airline.dat",ios::in);
 filfltn.seekg(0,ios::beg);
 do
 {
   if (!filfltn.fail())
   {
     if (!filfltn.eof())
     {
filfltn.read((char*)&item,sizeof(airline));
tticketno=item.ticketno;
     }
   }
   else
   {
     tticketno=200;
     item.ticketno=tticketno;
     /*cout<<"\n File is Empty..."; */
     break;
   }
 }
 while(!filfltn.eof());
 filfltn.close();
}
void airline::ticketcancel()
{
 fstream tfilin;
 fstream filin;
 filin.open("airline.dat",ios::in);
 tfilin.open("tairline.dat",ios::out);
 filin.seekg(0,ios::beg);

 cout<<"\nEnter the TICKET NO. to Cancel :-";
 cin>>tticketno;
 flag=0;

 while (!filin.eof())
 {
   if (!filin.fail())
   {
     filin.read((char*)&item,sizeof(airline));
     if (!filin.eof())
     {
if (item.ticketno==tticketno)
{
  flag=1;
  cout<<"\n TICKET No Exist.... Details are:-";
  item.datadisplay();
  cout<<"\n TICKET No. Has been CANCELLED...";
}
else
  tfilin.write((char*)&item,sizeof(airline));
     }
     else
     break;
   }
   else
   {
     cout<<"\n File Fail to open...";
     cout<<"\n File is Empty...";
     break;
   }
 }
 filin.close();
 tfilin.close();

 if (flag==1)
 {
   filin.open("airline.dat",ios::out);
   tfilin.open("tairline.dat",ios::in);
   tfilin.seekg(0,ios::beg);

   while (!tfilin.eof())
   {
     if (!tfilin.fail())
     {
tfilin.read((char*)&item,sizeof(airline));
if (!tfilin.eof())
  filin.write((char*)&item,sizeof(airline));
else
  break;
     }
   }
 }
 else
   cout<<"\n Sorry TICKET No. Does Not Exits...";
 tfilin.close();
 filin.close();
}


void main()
{
 int c,p;
 char choice;
 clrscr();
 do
 {
   item.menu();
   cout<<"Enter your choice\n";
   cin>>c;

   switch(c)
   {
     case 1:
cout<<"\n";
cout<<"\nPlease enter the no. of persons boarding\n";
cin>>p;
if(p>200)
{
  cout<<"\nSorry!seats are not available\n";
  cout<<"\nPlease book in other classes";
  break;
}
item.findlastticketno();
fstream filin;
filin.open("airline.dat",ios::app);
while(p!=0)
{
  f1.routes();
  cout<<"Please enter the code no. of the routes\n";
  cin>>a2;
  f1.dateflagchecking();

  cout<<"\n";
  item.datainput();
  item.dataprocessing();
  filin.write((char*)&item,sizeof(airline));
  p--;
}
filin.close();
break;
     case 2:
ch=0,ad=0;
fstream filre;
filre.open("airline.dat",ios::in);
filre.seekg(0,ios::beg);
while (!filre.eof())
{
  if (!filre.fail())
  {
      filre.read((char*)&item,sizeof(airline));
      if (!filre.eof())
      {
	item.datadisplay();
	if (tage<=12)
	  ch++;
	else
	  ad++;
      }
  }
  else
  {
    cout<<"\n File Fail to open...";
    cout<<"\n File is Empty...";
    break;
  }
}
filre.close();
break;
     case 3:
item.ticketcancel();
break;
     case 4:
exit(0);
   }
   cout<<"\nDo U Want to Continue.... Enter[Y][y] or [N][n]: ";
   cin>>choice;
 }
 while(choice=='y'||choice=='Y');
 cout<<"\nNo. of persons boarding"<<"\t"<<ad+ch;
 cout<<"\nadults   :"<<ad;
 cout<<"\tchildren :"<<ch;
 getch();
}

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If you're using c++ then your #include'd headers should be

<iostream>

not <iostream.h>

 

main() returns int

 

You could easily avoid using the non-standard headers such as conio.

As it is, your code will not work on most compilers.

 clrscr();
         ^
bookworm.cpp(39) : Error: undefined identifier 'clrscr'
 clrscr();
         ^
bookworm.cpp(505) : Error: undefined identifier 'clrscr'

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