c++如何获取数值极值的办法

include <iostream>

#include <limits>

using namespace std;

#define L_VALUE(a) (cout<<(#a)<<" is "<<(a)<<endl)

#define L_ADDR(a) printf("%p\n", a)

int main()

{

  L_VALUE(numeric_limits<short>::max());

  L_VALUE(numeric_limits<int>::max());

  L_VALUE(numeric_limits<long>::max());

  L_VALUE(numeric_limits<float>::max());

  L_VALUE(numeric_limits<double>::max());

  getchar();

  getchar();

  return 0;

}