how refrence and pointer works in a function
int func (int a) {
a = 300;
return a;
}
int func2 (int& a) {
a = -2;
return a;
}
int func3 (long* a) {
*a = 10;
return *a;
}
int main()
{
int a = 0;
int b = 0;
int c = 0;
long *d = new long (300);
cout << func(a) << ' ' << a << '\n'; // 300 0
cout << func2(b) << ' ' << b << '\n'; // -2 -2
cout << func3(d) << ' ' << *d << '\n'; // 10 10
keep_window_open();
}