hi,
what would be the best (and jet simplest) way to avoid errors in the following situation.
so i am reading a two column file:
fileCode:fstream fs; int a, b; while(fs.good()){ fs >> a >> b; }
if values are missin, or not formated properly, the above read function will produce problems. what would be the most effective way to limit the read to 2 columns only and if no value is assigned then set the value to -1.Code:1 2 2 3 4 6 6 7 8 2 7 8 6 ...
thnx
Read the entire line into a string then process that string with a stringstream. If the string only contains one item the stream will be in an error state and you can discard/edit any input. If you can't just discard any "extra" information you'll need to "loop" through the string to insure there are only two entries.
Jim
Just declare two more variables, read into those, then check fs.good(). If fs.good(), then store those variables into a and b, otherwise store -1 into a and b.Originally Posted by baxy
If you want something more advanced, like the ability to keep parsing after receiving a line with an error on it, then you'll need to do something more complicated, like read a line at a time into a stringstream then parse it out of that.
Code://try //{ if (a) do { f( b); } while(1); else do { f(!b); } while(1); //}
