int,long,float,double 的最小值,最大值

#include 
#include 
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::min()<<"  ----  " <::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::max()<<"  ----  " <::max()  << endl;

	cout<::min()  << endl;
	
	cout.setf(ios::dec,ios::basefield); // 改回10进制显示	
	cout <<"unsigned int max = "<< numeric_limits::max()<<"  ----  " <::max()  << endl;
	
    cout<::min()  << endl;
	
	cout.setf(ios::dec,ios::basefield); // 改回10进制显示	
    cout <<"long max = "<< numeric_limits::max()<<"  ----  " <::max()  << endl;

	 cout<::min()  << endl;
	 
	 cout.setf(ios::dec,ios::basefield); // 改回10进制显示	
	 cout <<"unsigned long max = "<< numeric_limits::max()<<"  ----  " <::max()  << endl;
	 
	 cout<::min()  << endl;
    cout <<"float max = "<< numeric_limits::max()<<"  ----  " <::max()  << endl;

	cout<::min()  << endl;	   
	   cout <<"double max = "<< numeric_limits::max()<<"  ----  " <::max()  << endl;
       cout<

 

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