c-c++-limit

發表於
文章字數： 1.9k 所需閱讀時間 ≈ 3 分鐘

C/C++ limits

  • 在 c 中是 <limits.h>
  • 在 c++ 中是 <climits>
    :::info
    1、32位编译系统中:
    long 占4字节 int 占4字节 long int 占4字节
    2、64位编译系统中:
    long 占8字节 int 占4字节 long int 占8字节
    3、32位和64位编译系统中
    long long int 在32位和64位编译系统中，都占8字节
    :::

LONG_MAX

1
2
3
4
5
6
7
8
9
/* Minimum and maximum values a `signed long int' can hold.
   (Same as `int').  */
#ifndef __LONG_MAX__
#define __LONG_MAX__ 2147483647L
#endif
#undef LONG_MIN
#define LONG_MIN (-LONG_MAX-1)
#undef LONG_MAX
#define LONG_MAX __LONG_MAX__
name expresses possible value*
CHAR_BIT Number of bits in a char object (byte) 8 or greater*
SCHAR_MIN Minimum value for an object of type signed char -127 (-27+1) or less*
SCHAR_MAX Maximum value for an object of type signed char 127 (27-1) or greater*
UCHAR_MAX Maximum value for an object of type unsigned char 255 (28-1) or greater*
CHAR_MIN Minimum value for an object of type char either SCHAR_MIN or 0
CHAR_MAX Maximum value for an object of type char either SCHAR_MAX or UCHAR_MAX
MB_LEN_MAX Maximum number of bytes in a multibyte character, for any locale 1 or greater*
SHRT_MIN Minimum value for an object of type short int -32767 (-215+1) or less*
SHRT_MAX Maximum value for an object of type short int 32767 (215-1) or greater*
USHRT_MAX Maximum value for an object of type unsigned short int 65535 (216-1) or greater*
INT_MIN Minimum value for an object of type int -32767 (-215+1) or less*
INT_MAX Maximum value for an object of type int 32767 (215-1) or greater*
UINT_MAX Maximum value for an object of type unsigned int 65535 (216-1) or greater*
LONG_MIN Minimum value for an object of type long int -2147483647 (-231+1) or less*
LONG_MAX Maximum value for an object of type long int 2147483647 (231-1) or greater*
ULONG_MAX Maximum value for an object of type unsigned long int 4294967295 (232-1) or greater*
LLONG_MIN Minimum value for an object of type long long int -9223372036854775807 (-263+1) or less*
LLONG_MAX Maximum value for an object of type long long int 9223372036854775807 (263-1) or greater*
ULLONG_MAX Maximum value for an object of type unsigned long long int 18446744073709551615 (264-1) or greater*

reference