How to only read every 2nd line? Actually, look at this yourself...

[iNeedHelp]

Okay, here's whats inside myData.txt:

Natalie
1.000

John
2.000

Bob
3.000

I need to gather the total of ALL of those numbers. Here's what I got:

string name, data;
double sum( 0. );
ifstream in_stream( "myData.txt" );
while( getline(in_stream, name) ) // if you can get a name
{
	getline( in_stream, data); // then get the number!
	in_stream.ignore(1, '\n'); // ignore the new lines
	cout << data << endl; // output what you found
}

This outputs:

1.000
2.000
3.000

These are held as strings however, I have no clue how to cast these into doubles to add them all up. sum += static_cast<double>(data) doesn't work :(

[melkiy]

double d_data;
...
d_data = atof(data.c_str());

[iNeedHelp]

I cant use atof, we didn't learn it yet so its unallowed. Well, this works perfect...need some help though:

string name, data;
double tempNum, sum( 0. ); 
while( getline(in_stream, name) )
{

	in_stream >> tempNum;
	sum += tempNum;
	in_stream.ignore( 1, '\n' );
	in_stream.ignore( 1, '\n' );
	
}		
cout << sum << endl; // Outputs 6, perfect. 

Is that the proper way to do it? I ignore the 2 new lines that that follows the number.

John\n
2.000\n <--- ignore
\n <--- ignore

Correct or no?

[fatpizza99]

yeah that should work because getline would take in the newline byte.

i think you simplify it by changing it to in_stream.ignore( 2, '\n' );

and i think you should change your while loop statement so it stops at a newline byte.

So, getline(in_stream, name, '\n')