int、long、long long, double, long double取值范围

unsigned   int   0～4294967295   

int   2147483648～2147483647 
unsigned long 0～4294967295
long   2147483648～2147483647
long long的最大值：9223372036854775807
long long的最小值：-9223372036854775808
unsigned long long的最大值：1844674407370955161

__int64的最大值：9223372036854775807
__int64的最小值：-9223372036854775808
unsigned __int64的最大值：18446744073709551615

 1 #include<iostream>  
 2 #include<string>  
 3 #include <limits>  
 4 using namespace std;  
 5   
 6 int main()  
 7 {  
 8     cout << "type: \t\t" << "************size**************"<< endl;  
 9     cout << "bool: \t\t" << "所占字节数：" << sizeof(bool);  
10     cout << "\t最大值：" << (numeric_limits<bool>::max)();  
11     cout << "\t\t最小值：" << (numeric_limits<bool>::min)() << endl;  
12     cout << "char: \t\t" << "所占字节数：" << sizeof(char);  
13     cout << "\t最大值：" << (numeric_limits<char>::max)();  
14     cout << "\t\t最小值：" << (numeric_limits<char>::min)() << endl;  
15     cout << "signed char: \t" << "所占字节数：" << sizeof(signed char);  
16     cout << "\t最大值：" << (numeric_limits<signed char>::max)();  
17     cout << "\t\t最小值：" << (numeric_limits<signed char>::min)() << endl;  
18     cout << "unsigned char: \t" << "所占字节数：" << sizeof(unsigned char);  
19     cout << "\t最大值：" << (numeric_limits<unsigned char>::max)();  
20     cout << "\t\t最小值：" << (numeric_limits<unsigned char>::min)() << endl;  
21     cout << "wchar_t: \t" << "所占字节数：" << sizeof(wchar_t);  
22     cout << "\t最大值：" << (numeric_limits<wchar_t>::max)();  
23     cout << "\t\t最小值：" << (numeric_limits<wchar_t>::min)() << endl;  
24     cout << "short: \t\t" << "所占字节数：" << sizeof(short);  
25     cout << "\t最大值：" << (numeric_limits<short>::max)();  
26     cout << "\t\t最小值：" << (numeric_limits<short>::min)() << endl;  
27     cout << "int: \t\t" << "所占字节数：" << sizeof(int);  
28     cout << "\t最大值：" << (numeric_limits<int>::max)();  
29     cout << "\t最小值：" << (numeric_limits<int>::min)() << endl;  
30     cout << "unsigned: \t" << "所占字节数：" << sizeof(unsigned);  
31     cout << "\t最大值：" << (numeric_limits<unsigned>::max)();  
32     cout << "\t最小值：" << (numeric_limits<unsigned>::min)() << endl;  
33     cout << "long: \t\t" << "所占字节数：" << sizeof(long);  
34     cout << "\t最大值：" << (numeric_limits<long>::max)();  
35     cout << "\t最小值：" << (numeric_limits<long>::min)() << endl;  
36     cout << "unsigned long: \t" << "所占字节数：" << sizeof(unsigned long);  
37     cout << "\t最大值：" << (numeric_limits<unsigned long>::max)();  
38     cout << "\t最小值：" << (numeric_limits<unsigned long>::min)() << endl;  
39     cout << "double: \t" << "所占字节数：" << sizeof(double);  
40     cout << "\t最大值：" << (numeric_limits<double>::max)();  
41     cout << "\t最小值：" << (numeric_limits<double>::min)() << endl;  
42     cout << "long double: \t" << "所占字节数：" << sizeof(long double);  
43     cout << "\t最大值：" << (numeric_limits<long double>::max)();  
44     cout << "\t最小值：" << (numeric_limits<long double>::min)() << endl;  
45     cout << "float: \t\t" << "所占字节数：" << sizeof(float);  
46     cout << "\t最大值：" << (numeric_limits<float>::max)();  
47     cout << "\t最小值：" << (numeric_limits<float>::min)() << endl;  
48     cout << "size_t: \t" << "所占字节数：" << sizeof(size_t);  
49     cout << "\t最大值：" << (numeric_limits<size_t>::max)();  
50     cout << "\t最小值：" << (numeric_limits<size_t>::min)() << endl;  
51     cout << "string: \t" << "所占字节数：" << sizeof(string) << endl;  
52     // << "\t最大值：" << (numeric_limits<string>::max)() << "\t最小值：" << (numeric_limits<string>::min)() << endl;  
53     cout << "type: \t\t" << "************size**************"<< endl;  
54     return 0;  
55 }  

 

一字节表示八位，即：1byte = 8 bit;

int: 4byte =  32 bit 有符号signed范围：2^31-1 ~ -2^31即：2147483647 ~ -2147483648无符号unsigned范围：2^32-1 ~ 0即：4294967295 ~ 0

long: 4 byte = 32 bit 同int型

double: 8 byte = 64 bit 范围：1.79769e+308 ~ 2.22507e-308

long double: 12 byte = 96 bit 范围： 1.18973e+4932 ~ 3.3621e-4932

float: 4 byte = 32 bit 范围： 3.40282e+038 ~ 1.17549e-038

int、unsigned、long、unsigned long 、double的数量级最大都只能表示为10亿，即它们表示十进制的位数不超过10个，即可以保存所有9位整数。而short只是能表示5位；

http://blog.csdn.net/tenlee/article/details/44997015