Thread: reading from files????????

I need help i am making a program witch will write data to a file to store information and then later when used again can read the information and automaticly guess what user it is and put in his information.

Now my problem is that i can make files but i cannot read from them. Can anyone show me an example program or what i have to type to make my program read all of the data in the file??

thank you very much

ps
its for my dad's birthday

does this help?

Code:

#include <fstream>

int main()
  {
     ifstream file; // file of type input file stream;
     file.open("filename.txt"); //open filename.txt
     string info;       

     file.getline(info, 50); // get first line of text file and store in info;
     
     cout << info;  //output info to screen.
     file.close();   // close the file.
    return 0;
  }

i just wrote this off the top of my head.. its late here.. i could be completely off topic.. hope this helps in some small way anywayz..

[sarcasm]
What a great gift idea! A console program that reads in a file and displays it! So many uses!
[/sarcasm]

right all of u except tegwin, what is your problem!!!! first of all i dont have a freaking teacher, im only 13 and dont get that stuff yet

thank you tegwin, it helped alot i got it to read the first line of the file but what if i want it to read the second or the third??

thank you again

here is the code without your help. I tried inserting it but it gives me compile errors "string undifiened"

Code:

#include <iostream.h>
#include <fstream.h>

int main()
{
char quit;  

    quit = '\0';
    while (quit != 'q')
    {
int counter=0;
int time;
float amount;
float intrest;
cout<<"                          |---------------------|"<<endl;
cout<<"                          |     Bank Pogram     |"<<endl;
cout<<"                          |---------------------|"<<endl<<endl<<endl;
ofstream a_file("data.txt", ios::app);
cout<<"How much Money? ";
cin>>amount;
a_file<<"---------------------------------"<<endl<<endl<<"Start of Amount: $"<<amount;
cout<<endl<<"What is the intrest rate? ";
cin>>intrest;
cout<<endl<<"How long are you keeping it there? ";
cin>>time;

a_file<<endl<<endl<<intrest<<"% Intrest"<<endl<<endl<<"For "<<time<<" Years"<<endl<<endl;
for(;;)
{
if (counter<time)
{
amount = ((intrest/100)*amount)+amount;
counter++;
a_file<<"$"<<amount<<" <------Year "<<counter<<endl<<endl;

}
else
break;
}
cout <<endl<<"press q to quit" << endl; 
    cin >> quit;
}
return 0;
}

thank you very much. it works now. Where did you learn all this stuff cause im eager to learn more!

just one more thing what if i wanted to read only like the 3rd or 4th line?? Or what if i needed to put each of the lines in a different string so i can call them individually???

I think you can do like this:

Code:

int i;
for(i=0;!file.eof();i++);

Now create an array of strings

Code:

string *strArray = new string[i];

And read the file

Code:

file.seekg(0);
for(i=0;!file.eof();i++)
  file.getline(strArray[i], 50);