字节在计算机科学领域，字节指的是8位内存单元，常用byte/B表示，是度量计算机存储空间大小的度量单位。我们说的1KB就是1024个字节，即1024*8位。
在C++里，字节定义稍有不同。一个字节包含的位数可表示的状态（例如8位可表示的状态是256种）应足以覆盖基本字符集（ASCII）字符的个数。通常的C++实现中使用的字符系统是ASCII，所以在通常C++实现中，一个字节就是8位。但是在一些采用Unicode字符系统的C++实现中，可能使用16位或者32位字节。
c++如何查看字节
#include<iostream>
#include <limits>
using namespace std
int main()
{
cout << "type: tt" << "************size**************"<< endl
cout << "bool: tt" << "所占字节数：" << sizeof(bool)
cout << "t最大值：" << (numeric_limits<bool>::max)()
cout << "tt最小值：" << (numeric_limits<bool>::min)() << endl
cout << "char: tt" << "所占字节数：" << sizeof(char)
cout << "t最大值：" << (numeric_limits<char>::max)()
cout << "tt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 << "tt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 << "tt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 << "tt最小值：" << (numeric_limits<wchar_t>::min)() << endl
cout << "short: tt" << "所占字节数：" << sizeof(short)
cout << "t最大值：" << (numeric_limits<short>::max)()
cout << "tt最小值：" << (numeric_limits<short>::min)() << endl
cout << "int: tt" << "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: tt" << "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: tt" << "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: tt" << "************size**************"<< endl
return 0
