How to make this more professional ? change something on my work

#include

#include

#include

using namespace std;

// prototype

double getsales(string);

// prototype

void findbiggest(double, double, double, double);

// this is the main that will call both of those fonctions.

int main()

{

double ne, se, nw, sw;

cout < < " this program determines which of a company’s four divisions (northeast, southeast, northwest, and southwest) had the greatest sales for a quarter." < < "\n"<
// this is to call function getsales for each division.

ne = getsales("northeast");

se = getsales("southeast");

nw = getsales("northwest");

sw = getsales("southwest");

// this is to call the function findhighest

findbiggest(ne, se, nw, sw);

return 0;