Output File Streams

#include <fstream>

using std::ofstream;

Insertion or << 

cout << x; //data flowing from x in to cout;

ofstream out;
out.open( "myOutputfile.txt" );//open a file for writing

I/O Manipulation Library

#include <iomanip> 

setw - sets how many characters wide the output should be 
you must use this each time you want to set the width

setprecision - sets how many decimal places a decimal number should have