Can someone tell how to read every second line of this code.. and for the search

[nemesiscplusplus]

Here is my code pal

#include <iostream>
#include <stdio.h>
#include <fstream>
#include <string>
using namespace std;

int main()
{
FILE *fp;
char *ptrname;
char *ptrseat;
int index;
char name[100];
char seat[20];
int selection;
ptrname = name;
ptrseat = seat;
char name1[100];


cout<<"Good Day Sir/Maam!\n";
cout<<"What is your First name?\n";
cin.getline(name,100);
cout<<"What do you want me to do?\n";
while (selection != 4)
{
cout<<"\n1. Check all user registered with their seats\n2. Check if my name is registered\n3. Register my name\n4. Exit\n";
cin>>selection;

switch (selection)
{
case 1:

cout<<"\nThe files from your text are: \n";
{
string line;

fstream myFile("Sample.txt");
if(myFile.is_open())
{
while (! myFile.eof())
{
getline (myFile,line);
cout<<line<<endl;

}
cin.get();
myFile.close();

cin.get();

cout<<"\nPress Enter\n";
system("pause");
system("cls");
}

else cout<<"Unable to open file";
cin.get();
}

break;
case 2:
cout<<"Check taken seats";
cin.get();
break;
case 3:

{
cout<<"What is the name? \n";
cin>>name1;
cin.get();
cout<<"Where do you want to seat? (<digits 1-8><letters a-z> sample 4B)\n";
cin>>seat;
cin.get();
ofstream outfile;
outfile.open("sample.txt", ios::out|ios::app);

outfile<<name1<<endl;
outfile<<seat<<endl;

cout<<"\nPress any key to exit\n";

cin.get();
outfile.close();

}
break;

case 4:
cout<<"Bye";
cin.get();
break;

default:
cout<<"Invalid";
system("cls");

break;
}
}
return 0;
}




How to read every second line of my code in the textfile?

[jsmith]

Read every line as you are, but just throw away (ignore) every other line you read.

[nemesiscplusplus]

how to throw every odd line i read sir? hmm thanks for the reply

[jsmith]

Consider this example:

ifstream input_file( "foo.txt" );
int           lines_read = 0;
string     line_of_file;

while( !input_file.eof() ) {
    getline( input_file, line_of_file );
    if( input_file ) {
        ++lines_read;
        if( lines_read % 2 == 0 )
            cout << "Read the line: " << line_of_file << endl;
    }
    else break;
}

[nemesiscplusplus]

Thanks pal. now i got it now.. hehe Now i can move to the next problem which is to search in my text file.. can someone help me again? hehe ^__^

I am glad that jsmith gives me the solution for my first problem

[nemesiscplusplus]

Thanks pal. now i got it now.. hehe Now i can move to the next problem which is to search in my text file.. can someone help me again? hehe ^__^

I am glad that jsmith gives me the solution for my first problem

[jsmith]

Search for what?

[nemesiscplusplus]

Sorry i didn't specify...

Just like if the user will search for the name...
There is a response that the name he/she search for is an existing name in the textfile. :)

Thank you for the reply sir.. I am so noob. sorry

by the way here is my code..


#include <iostream>
#include <stdio.h>
#include <fstream>
#include <string>
using namespace std;

int main()
{
FILE *fp;
char *ptrname;
char *ptrseat;
int index;
char name[100];
char seat[20];
int selection;
ptrname = name;
ptrseat = seat;
char name1[100];
int lines_read = 0;
string line_of_file;
string nameline;

cout<<"Good Day Sir/Maam!\n";
cout<<"What is your First name?\n";
cin.getline(name,100);
system("cls");
cout<<"What do you want me to do?\n";
while (selection != 5)
{
cout<<"\n1. Check all user registered with their seats\n2. Check if my name is registered\n3. Register someone\n4. Check Occupied Seats\n5. Exit\n";
cin>>selection;
system("cls");

switch (selection)
{
case 1:

cout<<"\nThe files from your text are: \n";
{
string line;

fstream myFile("Sample.txt");
if(myFile.is_open())
{
while (! myFile.eof())
{
getline (myFile,line);
cout<<line<<endl;

}
cin.get();
myFile.close();
system("pause");
system("cls");
}

else cout<<"Unable to open file";
}

break;
case 2:
cout<<"Well, let us see if you are registered here. . .\n";
{
ifstream input_file("sample.txt");

getline(input_file, line_of_file);
if(input_file)
{

if (line_of_file == name)
{

cout << "Seat number -> "<< line_of_file<<endl;
cout << "So you are already registered "<<name<<"\n";

}
else
cout<<"You are not registered\n";

}
else
break;

}
system("pause");
system("cls");
break;
case 3:

{
cout<<"What is the name? \n";
cin>>name1;
cin.get();
cout<<"Welcome Davao";
cout<<"Where do you want to seat? (<digits 1-8><letters a-z> sample 4B)\n";
cin>>seat;
cin.get();
ofstream outfile;
outfile.open("sample.txt", ios::out|ios::app);

outfile<<name1<<endl;
outfile<<seat<<endl;

system("pause");
system("cls");
outfile.close();

}
break;



case 4:
{
cout<<"Here are the list of the occupied seats\n";
ifstream input_file("sample.txt");
while ( !input_file.eof() )
{
getline(input_file, line_of_file);
if(input_file)
{
++lines_read;
if(lines_read % 2 == 0 )
cout << "Seat number -> "<< line_of_file<<endl;
}
else break;
}
}
system("pause");
system("cls");
break;

case 5:
cout<<"Bye";
cin.get();
break;

default:
cout<<"Invalid";
system("cls");

break;
}
}
return 0;
}




The case : 2 will check if your name is already registered in the text file.. My problem is .. am i on the right track? .. hehe because there is a problem in searching a string in my text file.

Another problem sir is how i can manage to return the name of the passenger and his seat in CASE 2


Thank you for trying sir.. :)