Thread: a little if of stream help please

well i still have a problem (dont get why it will compile perfectly)
but I thought i should start up my old thread again instead of making a new one so you can see previous problems.

Ifstream b_file will return the right info

Code:

ifstream b_file ( "input1.txt" );

but when i change all my code to use c_file it doesnt

Code:

ifstream c_file;
string num = "1";
string filename = "input";
//skip a few lines here to this
//while loop starts
string filename = "input"; //
filename += num + ".txt";
c_file.open( filename.c_str() );

and to debug i put this in there

Code:

cout<<filename;

and it returns input1.txt

I need c_file to increment so it has to work but i cant get it to work without incrementing

and by the way i dont need help with the incrementing i now have
a working code for incrementing(that I'm not using yet)


I can show you the whole code but its 422 lines of probably overly complicated junk

This works for me:

Code:

ifstream bfile("C:\\TestData\\data.txt");
if(!bfile)
{
	cout<<endl<<"Failed to open file"<<endl;
	return 1;
}
int input = 0;
bfile>>input;
cout<<input<<endl;

ifstream cfile("C:\\TestData\\data.txt");
if(!cfile)
{
	cout<<endl<<"Failed to open file"<<endl;
	return 1;
}

cfile>>input;
cout<<input<<endl;

Here's a more relevant version:

Code:

string filename = "C:\\TestData\\input"; 
string num = "1";

filename += num + ".txt";

ifstream bfile;
bfile.open( filename.c_str() );
if(!bfile)
{
	cout<<endl<<"Failed to open file"<<endl;
	return 1;
}

int input = 0;
bfile>>input;
cout<<input<<endl;

ifstream cfile;
cfile.open(filename.c_str());
if(!cfile)
{
	cout<<endl<<"Failed to open file"<<endl;
	return 1;
}

cfile>>input;
cout<<input<<endl;

If you're using a loop or opening more than one file with the same ifstream variable (like c_file), make sure you close the previous file (close()) and clear any error states (clear()) before opening the next one.