C/C++——求下面数据类型的最大值和最小值: char, short, int, long, float, double, long double和numeric_limits使用

numeric_limits参考标准库介绍：http://www.cplusplus.com/reference/limits/numeric_limits/

下面是一个小例子：

// numeric_limits example
#include <iostream>     // std::cout
#include <limits>       // std::numeric_limits

int main () {
  std::cout << std::boolalpha;
  std::cout << "Minimum value for int: " << std::numeric_limits<int>::min() << '\n';
  std::cout << "Maximum value for int: " << std::numeric_limits<int>::max() << '\n';
  std::cout << "int is signed: " << std::numeric_limits<int>::is_signed << '\n';
  std::cout << "Non-sign bits in int: " << std::numeric_limits<int>::digits << '\n';
  std::cout << "int has infinity: " << std::numeric_limits<int>::has_infinity << '\n';
  return 0;
}

输出：

Minimum value for int: -2147483648
Maximum value for int: 2147483647
int is signed: true
Non-sign bits in int: 31
int has infinity: false

求下面数据类型的最大值和最小值是什么:char, short, int, long, float, double, long double, unsigned

#include <iostream>
#include <limits>
#include <climits>//可以不要，里面有<span style="font-family: Arial, Helvetica, sans-serif;">CHAR_MAX 的定义</span>

using namespace std;

int main()
{
    cout << "char max = " << int(numeric_limits<char>::max()) << endl;
    cout << "char min = " << int(numeric_limits<char>::min()) << endl;

    //cout << "char max = " << CHAR_MAX << endl;
    //cout << "char min= " << CHAR_MIN << endl;

    cout << "short max = " << numeric_limits<short>::max() << endl;
    cout << "short min = " << numeric_limits<short>::min() << endl;

    cout << "int max = "