Use numeric_limits to get max value for float, double and long double
/* 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 maximum of floating-point types
cout << "max(float): "
<< numeric_limits<float>::max() << endl;
cout << "max(double): "
<< numeric_limits<double>::max() << endl;
cout << "max(long double): "
<< numeric_limits<long double>::max() << endl;
cout << endl;
}max(float): 3.40282e+038
max(double): 1.79769e+308
max(long double): 1.#INF
Use numeric_limits to get max value for short, int and long
/* 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 maximum of integral types
cout << "max(short): " << numeric_limits<short>::max() << endl;
cout << "max(int): " << numeric_limits<int>::max() << endl;
cout << "max(long): " << numeric_limits<long>::max() << endl;
cout << endl;
}max(short): 32767
max(int): 2147483647
max(long): 2147483647
Whether char is signed
/* 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
Whether numeric limits for type string exist
/* 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 numeric limits for type string exist
cout << "is_specialized(string): "
<< numeric_limits<string>::is_specialized << endl;
}is_specialized(string): false
