C++基本类型最大值

类型位范围

char1 个字节-128 到 127 或者 0 到 255

unsigned char1 个字节0 到 255

signed char1 个字节-128 到 127

int4 个字节-2147483648 到 2147483647

unsigned int4 个字节0 到 4294967295

signed int4 个字节-2147483648 到 2147483647

short int2 个字节-32768 到 32767

unsigned short int2 个字节0 到 65,535

signed short int2 个字节-32768 到 32767

long int8 个字节-9,223,372,036,854,775,808 到 9,223,372,036,854,775,807

signed long int8 个字节-9,223,372,036,854,775,808 到 9,223,372,036,854,775,807

unsigned long int8 个字节0 到 18,446,744,073,709,551,615

float4 个字节精度型占4个字节（32位）内存空间，+/- 3.4e +/- 38 (~7 个数字)

double8 个字节双精度型占8 个字节（64位）内存空间，+/- 1.7e +/- 308 (~15 个数字)

long double16 个字节长双精度型 16 个字节（128位）内存空间，可提供18-19位有效数字。

wchar_t2 或 4 个字节1 个宽字符

---

#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;  }

最大值