Question

I have the following format. Each line has two integers and the file is ended by “*”. How can I read the two numbers from the file. Thanks.

4 5
7 8
78 89
 *  //end of file

Edit

I know read the two numbers but do not know how to deal with “*”. If I store each number as integer type and read them by cin. But The last line is a string type. So the problem is that I read it as a integer but it is string, I do not how to judge whether it is * or not.

My code was as follows (it is obviously incorrect):

string strLine,strChar;
istringstream istr;
int a,b;
while(getline(fin,strChar))
{
    istr.str(strLine);
    istr>> ws; 
    istr>>strChar;


    if (strChar=="*")
    {
        break;
    }
    istr>>a>>b;
}

Answer 1

You can simply pull the numbers from the ifstream object until it fails.

std::ifstream fin("file.txt");

int num1, num2;
while (fin >> num1 >> num2)
{
    // do whatever with num1 and num2
}