C/C++ 基本数据类型的范围

一、常见的数据类型及其范围

数据类型	Size(64位)	范围
int	4Byte	$-2\times 10^{10}\sim 2\times10^{10}$
unsigned int	4Byte	$0\sim4\times 10^{10}$
long	4Byte	$-2\times 10^{10}\sim 2\times10^{10}$
unsigned long	4Byte	$0\sim4\times 10^{10}$
long long	8Byte	$-0.9\times 10^{20}\sim 0.9\times 10^{20}$
unsigned long long	8Byte	$0\sim 1.8\times 10^{20}$

查询Size代码：sizeof(类型)

查询范围代码：numeric_limits<类型>::max和numeric_limits<类型>::min

#include<iostream>
#include<string>
#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;cout << "type: \t\t" << "************size**************"<< endl;return 0;
}