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编程语言进行编程时，需要用到各种变量来存储各种信息

2026-02-11 分类：服务器百科 阅读(11) 评论(0)

C++ 数据类型

使用编程语言进行编程时，需要用到各种变量来存储各种信息。变量保留的是它所存储的值的内存位置。这意味着，当您创建一个变量时，就会在内存中保留一些空间。

您可能需要存储各种数据类型（比如字符型、宽字符型、整型、浮点型、双浮点型、布尔型等）的信息，操作系统会根据变量的数据类型，来分配内存和决定在保留内存中存储什么。

基本的内置类型

C++ 为程序员提供了种类丰富的内置数据类型和用户自定义的数据类型。下表列出了七种基本的 C++ 数据类型：

类型关键字
布尔型 bool
字符型 char
整型 int
浮点型 float
双浮点型 double
无类型 void
宽字符型

wchar_t

其实 wchar_t 是这样来的：

typedef short int wchar_t;

所以 wchar_t 实际上的空间是和 short int 一样。

一些基本类型可以使用一个或多个类型修饰符进行修饰：

修饰符描述示例
signed 表示有符号类型（默认） signed int x = -10;
unsigned 表示无符号类型 unsigned int y = 10;
short 表示短整型 short int z = 100;
long 表示长整型 long int a = 100000;
const 表示常量，值不可修改 const int b = 5;
volatile 表示变量可能被意外修改，禁止编译器优化 volatile int c = 10;
mutable 表示类成员可以在 const 对象中修改 mutable int counter;

下表显示了各种变量类型在内存中存储值时需要占用的内存，以及该类型的变量所能存储的最大值和最小值。

注意：不同系统会有所差异，一字节为 8 位。

注意：默认情况下，int、short、long都是带符号的，即 signed。

注意：long int 8 个字节，int 都是 4 个字节，早期的 C 编译器定义了 long int 占用 4 个字节，int 占用 2 个字节，新版的 C/C++ 标准兼容了早期的这一设定。

数据类型描述大小（字节）范围/取值示例
bool 布尔类型，表示真或假 1 true 或 false
char 字符类型，通常用于存储 ASCII 字符 1 -128 到 127 或 0 到 255
signed char 有符号字符类型 1 -128 到 127
unsigned char 无符号字符类型 1 0 到 255
wchar_t 宽字符类型，用于存储 Unicode 字符 2 或 4 取决于平台
char16_t 16 位 Unicode 字符类型（C++11 引入） 2 0 到 65,535
char32_t 32 位 Unicode 字符类型（C++11 引入） 4 0 到 4,294,967,295
short 短整型 2 -32,768 到 32,767
unsigned short 无符号短整型 2 0 到 65,535
int 整型 4 -2,147,483,648 到 2,147,483,647
unsigned int 无符号整型 4 0 到 4,294,967,295
long 长整型 4 或 8 取决于平台
unsigned long 无符号长整型 4 或 8 取决于平台
long long 长长整型（C++11 引入） 8 -9,223,372,036,854,775,808 到 9,223,372,036,854,775,807
unsigned long long 无符号长长整型（C++11 引入） 8 0 到 18,446,744,073,709,551,615
float 单精度浮点数 4 约 ±3.4e±38（6-7 位有效数字）
double 双精度浮点数 8 约 ±1.7e±308（15 位有效数字）
long double 扩展精度浮点数 8、12 或 16 取决于平台

C++11 新增类型

数据类型描述示例
auto 自动类型推断 auto x = 10;
decltype 获取表达式的类型 decltype(x) y = 20;
nullptr 空指针常量 int* ptr = nullptr;
std::initializer_list 初始化列表类型 std::initializer_list<int> list = {1, 2, 3};
std::tuple 元组类型，可以存储多个不同类型的值 std::tuple<int, float, char> t(1, 2.0, 'a');

注意，各种类型的存储大小与系统位数有关，但目前通用的以64位系统为主。

以下列出了32位系统与64位系统的存储大小的差别（windows 相同）：

从上表可得知，变量的大小会根据编译器和所使用的电脑而有所不同。

下面实例会输出您电脑上各种数据类型的大小。

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https://avg.163.com/topic/detail/11122041

实例

#include<iostream> #include <limits> using namespace std; int main() { cout << "type: \\t\\t" << "************size**************"<< endl; cout << "bool: \\t\\t" << "所占字节数：" << sizeof(bool); cout << "\\t最大值：" << (numeric_limits<bool>::max)(); cout << "\\t\\t最小值：" << (numeric_limits<bool>::min)() << endl; cout << "char: \\t\\t" << "所占字节数：" << sizeof(char); cout << "\\t最大值：" << (numeric_limits<char>::max)(); cout << "\\t\\t最小值：" << (numeric_limits<char>::min)() << endl; cout << "signed char: \\t" << "所占字节数：" << sizeof(signed char); cout << "\\t最大值：" << (numeric_limits<signed char>::max)(); cout << "\\t\\t最小值：" << (numeric_limits<signed char>::min)() << endl; cout << "unsigned char: \\t" << "所占字节数：" << sizeof(unsigned char); cout << "\\t最大值：" << (numeric_limits<unsigned char>::max)(); cout << "\\t\\t最小值：" << (numeric_limits<unsigned char>::min)() << endl; cout << "wchar_t: \\t" << "所占字节数：" << sizeof(wchar_t); cout << "\\t最大值：" << (numeric_limits<wchar_t>::max)(); cout << "\\t\\t最小值：" << (numeric_limits<wchar_t>::min)() << endl; cout << "short: \\t\\t" << "所占字节数：" << sizeof(short); cout << "\\t最大值：" << (numeric_limits<short>::max)(); cout << "\\t\\t最小值：" << (numeric_limits<short>::min)() << endl; cout << "int: \\t\\t" << "所占字节数：" << sizeof(int); cout << "\\t最大值：" << (numeric_limits<int>::max)(); cout << "\\t最小值：" << (numeric_limits<int>::min)() << endl; cout << "unsigned: \\t" << "所占字节数：" << sizeof(unsigned); cout << "\\t最大值：" << (numeric_limits<unsigned>::max)(); cout << "\\t最小值：" << (numeric_limits<unsigned>::min)() << endl; cout << "long: \\t\\t" << "所占字节数：" << sizeof(long); cout << "\\t最大值：" << (numeric_limits<long>::max)(); cout << "\\t最小值：" << (numeric_limits<long>::min)() << endl; cout << "unsigned long: \\t" << "所占字节数：" << sizeof(unsigned long); cout << "\\t最大值：" << (numeric_limits<unsigned long>::max)(); cout << "\\t最小值：" << (numeric_limits<unsigned long>::min)() << endl; cout << "double: \\t" << "所占字节数：" << sizeof(double); cout << "\\t最大值：" << (numeric_limits<double>::max)(); cout << "\\t最小值：" << (numeric_limits<double>::min)() << endl; cout << "long double: \\t" << "所占字节数：" << sizeof(long double); cout << "\\t最大值：" << (numeric_limits<long double>::max)(); cout << "\\t最小值：" << (numeric_limits<long double>::min)() << endl; cout << "float: \\t\\t" << "所占字节数：" << sizeof(float); cout << "\\t最大值：" << (numeric_limits<float>::max)(); cout << "\\t最小值：" << (numeric_limits<float>::min)() << endl; cout << "size_t: \\t" << "所占字节数：" << sizeof(size_t); cout << "\\t最大值：" << (numeric_limits<size_t>::max)(); cout << "\\t最小值：" << (numeric_limits<size_t>::min)() << endl; cout << "string: \\t" << "所占字节数：" << sizeof(string) << endl; // << "\\t最大值：" << (numeric_limits<string>::max)() << "\\t最小值：" << (numeric_limits<string>::min)() << endl; cout << "type: \\t\\t" << "************size**************"<< endl; return 0; }

本实例使用了 endl，这将在每一行后插入一个换行符，<< 运算符用于向屏幕传多个值，sizeof() 运算符用来获取各种数据类型的大小。

当上面的代码被编译和执行时，它会产生以下的结果，结果会根据所使用的计算机而有所不同：

type:         ************size**************
bool:         所占字节数：1    最大值：1        最小值：0
char:         所占字节数：1    最大值：        最小值：?
signed char:     所占字节数：1    最大值：        最小值：?
unsigned char:     所占字节数：1    最大值：?        最小值：
wchar_t:     所占字节数：4    最大值：2147483647        最小值：-2147483648
short:         所占字节数：2    最大值：32767        最小值：-32768
int:         所占字节数：4    最大值：2147483647    最小值：-2147483648
unsigned:     所占字节数：4    最大值：4294967295    最小值：0
long:         所占字节数：8    最大值：9223372036854775807    最小值：-9223372036854775808
unsigned long:     所占字节数：8    最大值：18446744073709551615    最小值：0
double:     所占字节数：8    最大值：1.79769e+308    最小值：2.22507e-308
long double:     所占字节数：16    最大值：1.18973e+4932    最小值：3.3621e-4932
float:         所占字节数：4    最大值：3.40282e+38    最小值：1.17549e-38
size_t:     所占字节数：8    最大值：18446744073709551615    最小值：0
string:     所占字节数：24
type:         ************size**************

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