c++ 类型int、long、double、char等的表示范围（最大最小值）

骑猪看日落 2022-07-27 14:57 300阅读 0赞

下面是一段测试代码

#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;  
        // << "\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;  
    }

这是vs2012 的输出

![SouthEast][]

这是GCC version 5.1.0 (tdm-1)的输出

![SouthEast 1][]

![SouthEast 2][]

转自：http://blog.csdn.net/xuexiacm/article/details/8122267

[SouthEast]: /images/20220727/9152e0059bc94e8abd837da652753a55.png
[SouthEast 1]: /images/20220727/13eb1d139c124897932f8a299673e12b.png
[SouthEast 2]: /images/20220727/ab844391ef3b4b41ab6135eb88499c09.png