while (! fin.eof)

[boogieman063]

what does this do?, while (! fin.eof). i wrote it in my notes but forgot why i wrote it down. please give detailed explanation if possible.

[Sixpac_XP]

is that C ?

[Sixpac_XP]

eof = end of file?

[originel]

it just keeps looping until the end of a file has been found. Technically the while loop waits until the eof (end of file) character has been read. It's part of the standard library.

[boogieman063]

sorry, i was not specific enough, it is c++, and i know that if loops till the end of the file, i suppose i need like a simple example if possible.

[originel]

void main()
{
     ifstream fin;
     char stuff;
     fin.open("myfile.txt");
     while(!fin.eof)
          fin>>stuff;
     fin.close();
}

[MadMan2k]

You can use a variation of it to check if the file is there:

ifstream inFile(file.txt);
if(! inFile)
{
cout << "File not found" << endl;
}

[boogieman063]

void main()
{
ifstream fin;
char stuff; //could this be used to get number values too
fin.open("myfile.txt"); //or is it just for char.
while(!fin.eof)
fin>>stuff; //could i fin multiple values like fin>>num1>>num2
fin.close(); //and would can if so could the num1 be an int and
} //num2 be a float.

i'm working on a program and we are supposed to call a function to read two values 1st one is an int and 2nd one is a float. but we can only use a one line call routine two get both numbers, and i dont know what type to make the function because its returning both an int and a float.
also when i call the function i dont know how to make it equal both numbers like
employeeid=data_in(fin); //both id and sales are supposed to come from data_in
sales=data_in(fin); //id is an int and sales is a float but who knows how
//you do that.

[MadMan2k]

C++ will read until it encounters a space or a tab, then skip to the next input variable, if one exists in the input statement.

If you declare an int object X, and a string object Y, and type:

inFile >> X >> Y

it will assign the integer value found at the beginning of the file to X, and the string object found after, to Y.