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| 在頭文件<stdint.h>中定義 |
|:----|
| PTRDIFF_MIN(C99)| ptrdiff_t類型(宏常量)|的對(duì)象的最小值
| PTRDIFF_MAX(C99)| ptrdiff_t類型(宏常量)|的對(duì)象的最大值
| SIZE_MAX(C99)| size_t類型(宏常量)|的對(duì)象的最大值
| SIG_ATOMIC_MIN(C99)| sig_atomic_t類型(宏常量)|的對(duì)象的最小值
| SIG_ATOMIC_MAX(C99)| sig_atomic_t類型(宏常量)|的對(duì)象的最大值
| 在頭文件<wchar.h>中定義 |
| WCHAR_MIN(C99)| wchar_t類型(宏常量)|的對(duì)象的最小值
| WCHAR_MAX(C99)| wchar_t類型(宏常量)|的對(duì)象的最大值
| WINT_MIN(C99)| wint_t類型(宏常量)|的對(duì)象的最小值
| WINT_MAX(C99)| wint_t類型(宏常量)|的對(duì)象的最大值
#include <stdio.h>#include <stdint.h>#include <wchar.h> int main(void){ printf("PTRDIFF_MIN = %td\n", PTRDIFF_MIN); printf("PTRDIFF_MAX = %+td\n", PTRDIFF_MAX); printf("SIZE_MAX = %zu\n", SIZE_MAX); printf("SIG_ATOMIC_MIN = %+jd\n",(intmax_t)SIG_ATOMIC_MIN); printf("SIG_ATOMIC_MAX = %+jd\n",(intmax_t)SIG_ATOMIC_MAX); printf("WCHAR_MIN = %+jd\n",(intmax_t)WCHAR_MIN); printf("WCHAR_MAX = %+jd\n",(intmax_t)WCHAR_MAX); printf("WINT_MIN = %jd\n", (intmax_t)WINT_MIN); printf("WINT_MAX = %jd\n", (intmax_t)WINT_MAX);}
可能的輸出:
PTRDIFF_MIN = -9223372036854775808PTRDIFF_MAX = +9223372036854775807SIZE_MAX = 18446744073709551615SIG_ATOMIC_MIN = -2147483648SIG_ATOMIC_MAX = +2147483647WCHAR_MIN = -2147483648WCHAR_MAX = +2147483647WINT_MIN = 0WINT_MAX = 4294967295
| 在頭文件<limits.h>中定義 |
|:----|
| CHAR_BIT | 字節(jié)中的位數(shù)(宏常量)|
| MB_LEN_MAX | 多字節(jié)字符中的最大字節(jié)數(shù)(宏常量)|
| CHAR_MIN | char(宏常量)|的最小值
| CHAR_MAX | char(宏常量)|的最大值
| SCHAR_MINSHRT_MININT_MINLONG_MINLLONG_MIN(C99)| signed char,short,int,long和long long的最小值(宏常量)|
| SCHAR_MAXSHRT_MAXINT_MAXLONG_MAXLLONG_MAX(C99)| signed char,short,int,long和long long的最大值(宏常量)|
| UCHAR_MAXUSHRT_MAXUINT_MAXULONG_MAXULLONG_MAX(C99)| unsigned char,unsigned short,unsigned int,unsigned long和unsigned long long的最大值(宏常量)|
#include <stdio.h>#include <limits.h> int main(void){ printf("CHAR_BIT = %d\n", CHAR_BIT); printf("MB_LEN_MAX = %d\n", MB_LEN_MAX); printf("\n"); printf("CHAR_MIN = %+d\n", CHAR_MIN); printf("CHAR_MAX = %+d\n", CHAR_MAX); printf("SCHAR_MIN = %+d\n", SCHAR_MIN); printf("SCHAR_MAX = %+d\n", SCHAR_MAX); printf("UCHAR_MAX = %u\n", UCHAR_MAX); printf("\n"); printf("SHRT_MIN = %+d\n", SHRT_MIN); printf("SHRT_MAX = %+d\n", SHRT_MAX); printf("USHRT_MAX = %u\n", USHRT_MAX); printf("\n"); printf("INT_MIN = %+d\n", INT_MIN); printf("INT_MAX = %+d\n", INT_MAX); printf("UINT_MAX = %u\n", UINT_MAX); printf("\n"); printf("LONG_MIN = %+ld\n", LONG_MIN); printf("LONG_MAX = %+ld\n", LONG_MAX); printf("ULONG_MAX = %lu\n", ULONG_MAX); printf("\n"); printf("LLONG_MIN = %+lld\n", LLONG_MIN); printf("LLONG_MAX = %+lld\n", LLONG_MAX); printf("ULLONG_MAX = %llu\n", ULLONG_MAX); printf("\n");}
可能的輸出:
CHAR_BIT = 8MB_LEN_MAX = 16 CHAR_MIN = -128CHAR_MAX = +127SCHAR_MIN = -128SCHAR_MAX = +127UCHAR_MAX = 255 SHRT_MIN = -32768SHRT_MAX = +32767USHRT_MAX = 65535 INT_MIN = -2147483648INT_MAX = +2147483647UINT_MAX = 4294967295 LONG_MIN = -9223372036854775808LONG_MAX = +9223372036854775807ULONG_MAX = 18446744073709551615 LLONG_MIN = -9223372036854775808LLONG_MAX = +9223372036854775807ULLONG_MAX = 18446744073709551615
| 在頭文件<float.h> |中定義
|:----|
| FLT_RADIX | 所有三個(gè)浮點(diǎn)類型(宏常量)|的表示使用的基數(shù)(整數(shù)基數(shù))
| DECIMAL_DIG(C99)| 從long double轉(zhuǎn)換為decimal,至少DECIMAL_DIG digits并返回long double是標(biāo)識(shí)轉(zhuǎn)換:這是序列化/反序列化long double(宏常量)所需的十進(jìn)制精度。
| FLT_DECIMAL_DIGDBL_DECIMAL_DIGLDBL_DECIMAL_DIG(C11)| 從float / double / long double到decimal的轉(zhuǎn)換至少為FLT_DECIMAL_DIG / DBL_DECIMAL_DIG / LDBL_DECIMAL_DIG數(shù)字,后面是標(biāo)識(shí)轉(zhuǎn)換:這是序列化/反序列化浮點(diǎn)值所需的十進(jìn)制精度。分別定義為至少6,10和10,或者IEEE浮點(diǎn)數(shù)為9,IEEE雙精度為17。(另請(qǐng)參閱C ++ analog max_digits10)(宏常量)|
| FLT_MINDBL_MINLDBL_MIN | float,double和long double的最小值,標(biāo)準(zhǔn)化值,正值分別為(宏常量)|
| FLT_TRUE_MINDBL_TRUE_MINLDBL_TRUE_MIN(C11)| float,double和long double的最小正值分別為(宏常量)|
| FLT_MAXDBL_MAXLDBL_MAX | float,double和long double的最大值(宏常量)|
| FLT_EPSILONDBL_EPSILONLDBL_EPSILON | 1.0和浮點(diǎn)型,雙精度型和長雙精度型的下一個(gè)可表示值之間的差值(宏常數(shù))|
| FLT_DIGDBL_DIGLDBL_DIG | 保證保留在文本中的小數(shù)位數(shù) - > float / double / long double - >文本往返不會(huì)因四舍五入或溢出而發(fā)生變化(詳見C ++模擬位數(shù)10)(宏常量)|
| FLT_MANT_DIGDBL_MANT_DIGLDBL_MANT_DIG | 浮點(diǎn)尾數(shù)中可以表示的基FLT_RADIX數(shù)字的數(shù)量,并且可以分別表示浮點(diǎn),雙精度和長精度的精度(宏常數(shù))|
| FLT_MIN_EXPDBL_MIN_EXPLDBL_MIN_EXP | 最小的負(fù)整數(shù),使FLT_RADIX小于該整數(shù)的冪乘1是一個(gè)標(biāo)準(zhǔn)化的float,double和long double(宏常量)|
| FLT_MIN_10_EXPDBL_MIN_10_EXPLDBL_MIN_10_EXP | 最小負(fù)整數(shù),使得10次冪小于該整數(shù)時(shí),分別為標(biāo)準(zhǔn)化的float,double和long double(宏常量)|
| FLT_MAX_EXPDBL_MAX_EXPLDBL_MAX_EXP | 最大正整數(shù),使得FLT_RADIX由小于該整數(shù)的冪乘1產(chǎn)生一個(gè)歸一化的float,double和long double(宏常量)|
| FLT_MAX_10_EXPDBL_MAX_10_EXPLDBL_MAX_10_EXP | 最大正整數(shù),使得由小于該整數(shù)的冪次提升的10個(gè)是分別為標(biāo)準(zhǔn)化的float,double和long double(宏常量)|
| FLT_ROUNDS | 四舍五入浮點(diǎn)運(yùn)算模式,等于float_round_style(宏常量)|
| FLT_EVAL_METHOD(C99)| 對(duì)于中間結(jié)果使用擴(kuò)展精度:0未使用,1使用double來代替float,2使用long double(宏常量)|
| FLT_HAS_SUBNORMDBL_HAS_SUBNORMLDBL_HAS_SUBNORM(C11)| 該類型是否支持低于正常(非正常)數(shù)字:-1不確定,0不存在,1存在(宏常量)|
#include <stdio.h>#include <float.h> #include <math.h> int main(void){ printf("FLT_RADIX = %d\n", FLT_RADIX); printf("DECIMAL_DIG = %d\n", DECIMAL_DIG); printf("FLT_MIN = %e\n", FLT_MIN); printf("FLT_MAX = %e\n", FLT_MAX); printf("FLT_EPSILON = %e\n", FLT_EPSILON); printf("FLT_DIG = %d\n", FLT_DIG); printf("FLT_MANT_DIG = %d\n", FLT_MANT_DIG); printf("FLT_MIN_EXP = %d\n", FLT_MIN_EXP); printf("FLT_MIN_10_EXP = %d\n", FLT_MIN_10_EXP); printf("FLT_MAX_EXP = %d\n", FLT_MAX_EXP); printf("FLT_MAX_10_EXP = %d\n", FLT_MAX_10_EXP); printf("FLT_ROUNDS = %d\n", FLT_ROUNDS); printf("FLT_EVAL_METHOD = %d\n", FLT_EVAL_METHOD); printf("FLT_HAS_SUBNORM = %d\n", FLT_HAS_SUBNORM);}
可能的輸出:
FLT_RADIX = 2DECIMAL_DIG = 37FLT_MIN = 1.175494e-38FLT_MAX = 3.402823e+38FLT_EPSILON = 1.192093e-07FLT_DIG = 6FLT_MANT_DIG = 24FLT_MIN_EXP = -125FLT_MIN_10_EXP = -37FLT_MAX_EXP = 128FLT_MAX_10_EXP = 38FLT_ROUNDS = 1FLT_EVAL_METHOD = 1FLT_HAS_SUBNORM = 1