typedef signed char int8_t;//声明一个int8_t是signed char类型,占1个字节 typedef signed short int int16_t;//声明一个int16_t是signed short char类型,占2个字节 typedef signed int int32_t;//声明一个int32_t是signed int类型,占4个字节 typedef signed __INT64 int64_t;//声明一个int64_t是s...
typedef signed short int int16_t; typedef signed int int32_t; typedef unsigned char uint8_t; typedef unsigned short int uint16_t; typedef unsigned int uint32_t; typedef unsigned long long uint64_t; typedef signed char s8; typedef signed short int s16; typedef signed int s32; typedef ...
typedefsignedcharint8_t;typedefshortint16_t;typedefintint32_t;typedeflonglongint64_t; 用于区分该整数占用几个字节,在实际开发中,可以直接使用标准库中的类型:int8_t、int16_t、int32_t、int64_t,其中int8_t占用1个字节,int16_t占用2个字节,int32_t占用4个字节,int64_t占用8个字节。 我们还可以定义...
typedef signed int int16_t;//有符号16位数 typedef unsigned long uint32_t;//无符号32位数 typedef signed long int32_t;//有符号32位数 很显然就是使用了typedef关键字给既有数据类型分配了一个别名。当我们使用uint8_t时,就和使用unsigned char是一样的。如我们声明uint8_t var时,和使用unsigned char...
typedefsignedcharint8_t;typedefshortintint16_t;typedefintint32_t; 2、作用 1)增加代码的可读性 uint8_t,uint32_t能更明显的显示所占字节数。 uint8_t表示占1个字节(1 字节=8 bit); uint32_t表示占4个字节(4 字节=32 bit)。 2)增加代码的可维护性 ...
1typedef signedcharint8_t;2typedefshortint16_t;3typedefintint32_t;4typedeflonglongint64_t;5typedef unsignedcharuint8_t;6typedef unsignedshortuint16_t;7typedef unsignedintuint32_t;8typedef unsignedlonglonguint64_t; uint_8,uint_16,uint_32这样用无符号的数在进行嵌入式或者其他底层的数据处理中...
typedef __int64 intptr_t; 为了保证平台的通用性,程序中尽量不要使用long数据库型。可以使用固定大小的数据类型宏定义: typedefsignedcharint8_ttypedefshortintint16_t;typedefintint32_t;# if __WORDSIZE == 64typedeflongintint64_t;# else__extension__typedeflonglongintint64_t;#endif...
typedef unsigned char boolean; /* Boolean value type. */typedef unsigned long int uint32; /* Unsigned 32 bit value */typedef unsigned short uint16; /* Unsigned 16 bit value */typedef unsigned char uint8; /* Unsigned 8 bit value */typedef signed long int int32; /* Signed 32 bit val...
整型常数默认是signed int的。 对整型常数进⾏类型转换的后缀只有:u或U(unsigned)、l或L(long)、u/U与l/L的组合(如:ul、lu、Lu等)。例:100u; -123u; 0x123l; (2)浮点常数的表⽰形式有:科学计数形式和⼩数点形式。 浮点常数默认是double的。 对浮点常数进⾏类型转换的后缀只有:f或F(单精度...
int long mutable namespace new noexcept (C++11) not not_eq nullptr (C++11) operator or or_eq private protected public register reinterpret_cast requires (C++20) return short signed sizeof (*) static static_assert (C++11) static_cast