Question

is it possible to use getline inside for loop ? C++

string line; // these are just example so I am not writing whole codes...

It seems it only works if I do getline(file, line) // I am doing this as in reading the file. But I guess you can think of getline(cin, string variable) as well

and then I go (for int i=0; i < line.length(); i++)
cout << line << endl;

something like that.

When I placed getline(file, line) inside the for loop, there was no compilation error but the output was wrong (sometimes blank).

Why is that happening? (example with codes would be great).

Answer 1

`Hey,

Note: If you have any queries related the answer please do comment. I would be very happy to resolve all your queries.

First we will look at how getline actually works

Basically when you call getline(file,line) it reads the next line from the file.

So, for first call it reads 1st whole line, for 2nd it reads 2nd and so on...

So, now when you run getline inside a for loop. It will give output of lines but, when there will not be any it will return NULL which means no line.

So, you should have a criteria as

if(!getline(file,line))

{

break;

}

It will break the loop when file reaches end

Kindly revert for any queries

Thanks.