Whether char is signed : numeric_limits « STL Algorithms Helper « C++ Tutorial






  1. C++ Tutorial
  2. STL Algorithms Helper
  3. numeric_limits
/* The following code example is taken from the book
 * "The C++ Standard Library - A Tutorial and Reference"
 * by Nicolai M. Josuttis, Addison-Wesley, 1999
 *
 * (C) Copyright Nicolai M. Josuttis 1999.
 * Permission to copy, use, modify, sell and distribute this software
 * is granted provided this copyright notice appears in all copies.
 * This software is provided "as is" without express or implied
 * warranty, and with no claim as to its suitability for any purpose.
 */
#include <iostream>
#include <limits>
#include <string>
using namespace std;

int main()
{
   // use textual representation for bool
   cout << boolalpha;

   // print whether char is signed
   cout << "is_signed(char): "
        << numeric_limits<char>::is_signed << endl;
   cout << endl;
}

is_signed(char): true




32.15.numeric_limits
32.15.1.Use numeric_limits to get max value for short, int and long
32.15.2.Use numeric_limits to get max value for float, double and long double
32.15.3.Whether char is signed
32.15.4.Whether numeric limits for type string exist