know the number of columns from text file, separated by space or tab

Question

I need to know the number of columns from a text file with floats.

I\'ve made like this to know the number of lines:

inFile.open(pathV); 

// checks if f         


        

Answer 1

Given a line you have read, called line this works:

std::string line("189.53  58.867  74.254  72.931  80.354");
std::istringstream iss(line);
int columns = 0;
do
{
    std::string sub;
    iss >> sub;
    if (sub.length())
        ++columns;
}
while(iss);

I don't like that this reads the whole line, and then reparses it, but it works.

There are various other ways of splitting strings e.g. boost's See previous post here