Thread: Reading a file to variables

Hello.
I want to make a program that can read a normal txt file and set certain lines to certain variables...

heres an example, say i have,
int a, b, c, d;
and then the file looks like this...

this is my file
b: 2
and other stuff in between the values i want.
d: 8
and so on
a: 1
so i have a pretty much jumbled file
c: 9

and then i want my code to go through the file and set variables according to the file, i.e b=2 etc... i was thinking of using strcmp to search the file a: b: etc..., but then how could i put the value thats directly after the target into the variable

use seekp (or seekg, i forget which one) if you're using an fstream. use google for documentation on those.

Code:

char numeric[] =  "1234567890";

int a, b, c, d;
char buf[20];

ifstream fin("filename.txt");
while (!ifstream.eof())
{
      ifstream.getline(buf, 19, '\n');

      char *found = strpbrk(buf, numeric);
      int extractedDigit = atoi(found);

      switch(buf[0])
      {
            case 'a': a = extractedDigit;
            break;
            // ...
      }
}

You could use something like that. (Hell, I hope that works) Although, with a little added complexity, i'm pretty sure you could trash the switch statement for a token pasting macro.