C++: max integer [duplicate]

Answer 1

On Hp UX with aCC compiler:

#include 
#include 
using namespace std;

int main () {
  if (sizeof(int)==sizeof(long)){
    cout<<"sizeof int == sizeof long"<::max()==numeric_limits::max()){
    cout<<"INT_MAX == lONG_MAX"<::max() << endl;
  cout << "Maximum value for long: " << numeric_limits::max() << endl;
  return 0;
}

It prints:

sizeof int == sizeof long

INT_MAX != LONG_MAX

I checked both int and long types are 4bytes. manpage limits(5) says that INT_MAX and LONG_MAX are both 2147483647

http://nixdoc.net/man-pages/HP-UX/man5/limits.5.html

So, conclusion std::numeric_limits< type >:: is not portable.