Du kan bruge _getch() i stedet, så skal du bare lige huske at inkluderer conio.h også.
#include<iostream>
#include <conio.h>
using namespace std;
int main(void)
{
double dnumber1 = 0.0;
double dnumber2 = 0.0;
double dnumber3 = 0.0;
double daverage = 0.0;
cout << "Vær venlig og skriv 3 numre." << endl;
cin >> dnumber1;
cin >> dnumber2;
cin >> dnumber3;
daverage = (dnumber1 + dnumber2 + dnumber3) / 3;
cout << "Numrennes gennemsnit er:" << daverage << endl << endl;
_getch();
return 0;
}