Basic data types for C + +

A basic data:

（1）整型：                                        short 至少16 位                                        int 至少与short长度相同                                        long 至少32位，至少与int一样长                                        long long 至少64位，至少与long一样长（2）浮点数：                                        float 至少32位                                        double 至少48位（主流为64位）                                        long double 至少与double相同

Two data limitations:
Restrictions on data types on different platforms need to be viewed using Limits.h or climits header files

        Symbolic constant meaning Char_bit                                           The number of bits of char Char_max the maximum value of char Char_min                                        The minimum value of char Schar_max the maximum value of signed Char Schar_min        Signed char minimum value Uchar_max unsigned char maximum Shrt_max short Type maximum value shrt_min short                                             The minimum value of the type Ushrt_max the maximum value of the unsigned short type Int_max                                           The maximum value of the integral type Int_min the minimum value of the integer Unit_max                                          Maximum value of the unsigned integer long_max LONG long_minThe minimum value of long ulong_max the maximum value of the unsigned long Llong_max                                    The maximum value of long long llong_min the minimum value of long long Ullong_max Unsigned long Long's maximum value PS: see/usr/include/limits.h for more details

Three data suffixes:
To explicitly declare the type of a constant, you add a suffix at the end of the constant, and the type of the default constant is int

                 L :      long      （对于double 使用L)                 U :     unsigned                  LL:    long long                 F:      float

Four about coercion type conversions:

                        c 类型形式：      （type） var_or_const                        c++    形式：         type ( var_or_const )                        c++    形式：         static_cast<type>( var_or_const)

Basic data types for C + +