int,long,float,double 的最小值,最大值

#include <iostream>#include <limits>using namespace std;void main(){    // 用 limits.h 头文件    //cout.setf(ios::hex,ios::basefield);//设置十六进制显示数值 cout.setf(ios::showbase|ios::uppercase);//设置0x头和大写// ---  int cout <<"int min = "<< numeric_limits<int>::min()<<"  ----  " <<hex<< numeric_limits<int>::min()  << endl;    cout.setf(ios::dec,ios::basefield); // 改回10进制显示  or   cout.unsetf(ios::hex) :取消16进制输出设置    cout <<"int max = "<< numeric_limits<int>::max()<<"  ----  " <<hex<< numeric_limits<int>::max()  << endl;cout<<endl;    cout.setf(ios::dec,ios::basefield); // 改回10进制显示cout <<"unsigned int min = "<< numeric_limits<unsigned int>::min()<<"  ----  " <<hex<< numeric_limits<unsigned int>::min()  << endl;cout.setf(ios::dec,ios::basefield); // 改回10进制显示cout <<"unsigned int max = "<< numeric_limits<unsigned int>::max()<<"  ----  " <<hex<< numeric_limits<unsigned int>::max()  << endl;    cout<<endl;   //----     cout.setf(ios::dec,ios::basefield); // 改回10进制显示 cout <<"long min = "<< numeric_limits<long>::min()<<"  ----  " <<hex<< numeric_limits<long>::min()  << endl;cout.setf(ios::dec,ios::basefield); // 改回10进制显示    cout <<"long max = "<< numeric_limits<long>::max()<<"  ----  " <<hex<< numeric_limits<long>::max()  << endl; cout<<endl; cout.setf(ios::dec,ios::basefield); // 改回10进制显示 cout <<"unsigned long min = "<< numeric_limits<unsigned long>::min()<<"  ----  " <<hex<< numeric_limits<unsigned long>::min()  << endl;  cout.setf(ios::dec,ios::basefield); // 改回10进制显示 cout <<"unsigned long max = "<< numeric_limits<unsigned long>::max()<<"  ----  " <<hex<< numeric_limits<unsigned long>::max()  << endl;  cout<<endl;//----  浮点数即使设置16进制也是按照10进制输出cout <<"float min = "<< numeric_limits<float>::min()<<"  ----  " <<hex<< numeric_limits<float>::min()  << endl;    cout <<"float max = "<< numeric_limits<float>::max()<<"  ----  " <<hex<< numeric_limits<float>::max()  << endl;cout<<endl;//--   cout <<"double min = "<< numeric_limits<double>::min()<<"  ----  " <<hex<< numeric_limits<double>::min()  << endl;      cout <<"double max = "<< numeric_limits<double>::max()<<"  ----  " <<hex<< numeric_limits<double>::max()  << endl;       cout<<endl;  }

 

limits.h 头文件:

/****limits.h - implementation dependent values**       Copyright (c) 1985-1997, Microsoft Corporation.  All rights reserved.**Purpose:*       Contains defines for a number of implementation dependent values*       which are commonly used in C programs.*       [ANSI]**       [Public]*****/#if     _MSC_VER > 1000#pragma once#endif#ifndef _INC_LIMITS#define _INC_LIMITS#if     !defined(_WIN32) && !defined(_MAC)#error ERROR: Only Mac or Win32 targets supported!#endif#define CHAR_BIT      8         /* number of bits in a char */#define SCHAR_MIN   (-128)      /* minimum signed char value */#define SCHAR_MAX     127       /* maximum signed char value */#define UCHAR_MAX     0xff      /* maximum unsigned char value */#ifndef _CHAR_UNSIGNED#define CHAR_MIN    SCHAR_MIN   /* mimimum char value */#define CHAR_MAX    SCHAR_MAX   /* maximum char value */#else#define CHAR_MIN      0#define CHAR_MAX    UCHAR_MAX#endif  /* _CHAR_UNSIGNED */#define MB_LEN_MAX    2             /* max. # bytes in multibyte char */#define SHRT_MIN    (-32768)        /* minimum (signed) short value */#define SHRT_MAX      32767         /* maximum (signed) short value */#define USHRT_MAX     0xffff        /* maximum unsigned short value */#define INT_MIN     (-2147483647 - 1) /* minimum (signed) int value */#define INT_MAX       2147483647    /* maximum (signed) int value */#define UINT_MAX      0xffffffff    /* maximum unsigned int value */#define LONG_MIN    (-2147483647L - 1) /* minimum (signed) long value */#define LONG_MAX      2147483647L   /* maximum (signed) long value */#define ULONG_MAX     0xffffffffUL  /* maximum unsigned long value */#if     _INTEGRAL_MAX_BITS >= 8#define _I8_MIN     (-127i8 - 1)    /* minimum signed 8 bit value */#define _I8_MAX       127i8         /* maximum signed 8 bit value */#define _UI8_MAX      0xffui8       /* maximum unsigned 8 bit value */#endif#if     _INTEGRAL_MAX_BITS >= 16#define _I16_MIN    (-32767i16 - 1) /* minimum signed 16 bit value */#define _I16_MAX      32767i16      /* maximum signed 16 bit value */#define _UI16_MAX     0xffffui16    /* maximum unsigned 16 bit value */#endif#if     _INTEGRAL_MAX_BITS >= 32#define _I32_MIN    (-2147483647i32 - 1) /* minimum signed 32 bit value */#define _I32_MAX      2147483647i32 /* maximum signed 32 bit value */#define _UI32_MAX     0xffffffffui32 /* maximum unsigned 32 bit value */#endif#if     _INTEGRAL_MAX_BITS >= 64/* minimum signed 64 bit value */#define _I64_MIN    (-9223372036854775807i64 - 1)/* maximum signed 64 bit value */#define _I64_MAX      9223372036854775807i64/* maximum unsigned 64 bit value */#define _UI64_MAX     0xffffffffffffffffui64#endif#if     _INTEGRAL_MAX_BITS >= 128/* minimum signed 128 bit value */#define _I128_MIN   (-170141183460469231731687303715884105727i128 - 1)/* maximum signed 128 bit value */#define _I128_MAX     170141183460469231731687303715884105727i128/* maximum unsigned 128 bit value */#define _UI128_MAX    0xffffffffffffffffffffffffffffffffui128#endif#ifdef  _POSIX_#define _POSIX_ARG_MAX      4096#define _POSIX_CHILD_MAX    6#define _POSIX_LINK_MAX     8#define _POSIX_MAX_CANON    255#define _POSIX_MAX_INPUT    255#define _POSIX_NAME_MAX     14#define _POSIX_NGROUPS_MAX  0#define _POSIX_OPEN_MAX     16#define _POSIX_PATH_MAX     255#define _POSIX_PIPE_BUF     512#define _POSIX_SSIZE_MAX    32767#define _POSIX_STREAM_MAX   8#define _POSIX_TZNAME_MAX   3#define ARG_MAX             14500       /* 16k heap, minus overhead */#define LINK_MAX            1024#define MAX_CANON           _POSIX_MAX_CANON#define MAX_INPUT           _POSIX_MAX_INPUT#define NAME_MAX            255#define NGROUPS_MAX         16#define OPEN_MAX            32#define PATH_MAX            512#define PIPE_BUF            _POSIX_PIPE_BUF#define SSIZE_MAX           _POSIX_SSIZE_MAX#define STREAM_MAX          20#define TZNAME_MAX          10#endif  /* POSIX */#endif  /* _INC_LIMITS */

 

另外可以参考 : http://blog.csdn.net/ACb0y/article/details/5336822

http://www.cppblog.com/eros/archive/2008/04/28/48387.html

关于进制的输出 参考:  http://blog.csdn.net/okadler0518/article/details/4962340