今天偶然间看到这个头文件inttypes,好奇有什么用，去找度娘玩了一波，发现这头文件挺有意思的。
这个头文件适配于C99标准，它提供整数输入的各种进制转换的宏,这是在Ubuntu上扣下来的代码（windows里我没找到放在哪）嗯~ o(￣▽￣)o我拿VScode找到了……所以划掉
不完整的
Ubuntu：
1 //这里应该是10进制的宏
2 /* Decimal notation. */
3 # define PRId8 "d"
4 # define PRId16 "d"
5 # define PRId32 "d"
6 # define PRId64 __PRI64_PREFIX "d"
7
8 # define PRIdLEAST8 "d"
9 # define PRIdLEAST16 "d"
10 # define PRIdLEAST32 "d"
11 # define PRIdLEAST64 __PRI64_PREFIX "d"
12
13 # define PRIdFAST8 "d"
14 # define PRIdFAST16 __PRIPTR_PREFIX "d"
15 # define PRIdFAST32 __PRIPTR_PREFIX "d"
16 # define PRIdFAST64 __PRI64_PREFIX "d"
17
18
19 # define PRIi8 "i"
20 # define PRIi16 "i"
21 # define PRIi32 "i"
22 # define PRIi64 __PRI64_PREFIX "i"
23
24 # define PRIiLEAST8 "i"
25 # define PRIiLEAST16 "i"
26 # define PRIiLEAST32 "i"
27 # define PRIiLEAST64 __PRI64_PREFIX "i"
28
29 # define PRIiFAST8 "i"
30 # define PRIiFAST16 __PRIPTR_PREFIX "i"
31 # define PRIiFAST32 __PRIPTR_PREFIX "i"
32 # define PRIiFAST64 __PRI64_PREFIX "i"
33
34 //感觉这里是8进制的宏
35 /* Octal notation. */
36 # define PRIo8 "o"
37 # define PRIo16 "o"
38 # define PRIo32 "o"
39 # define PRIo64 __PRI64_PREFIX "o"
40
41 # define PRIoLEAST8 "o"
42 # define PRIoLEAST16 "o"
43 # define PRIoLEAST32 "o"
44 # define PRIoLEAST64 __PRI64_PREFIX "o"
45
46 # define PRIoFAST8 "o"
47 # define PRIoFAST16 __PRIPTR_PREFIX "o"
48 # define PRIoFAST32 __PRIPTR_PREFIX "o"
49 # define PRIoFAST64 __PRI64_PREFIX "o"
50
51 //这里因该是无符号的宏
52 /* Unsigned integers. */
53 # define PRIu8 "u"
54 # define PRIu16 "u"
55 # define PRIu32 "u"
56 # define PRIu64 __PRI64_PREFIX "u"
57
58 # define PRIuLEAST8 "u"
59 # define PRIuLEAST16 "u"
60 # define PRIuLEAST32 "u"
61 # define PRIuLEAST64 __PRI64_PREFIX "u"
62
63 # define PRIuFAST8 "u"
64 # define PRIuFAST16 __PRIPTR_PREFIX "u"
65 # define PRIuFAST32 __PRIPTR_PREFIX "u"
66 # define PRIuFAST64 __PRI64_PREFIX "u"
67
68 //这里因该是小写16进制
69 /* lowercase hexadecimal notation. */
70 # define PRIx8 "x"
71 # define PRIx16 "x"
72 # define PRIx32 "x"
73 # define PRIx64 __PRI64_PREFIX "x"
74
75 # define PRIxLEAST8 "x"
76 # define PRIxLEAST16 "x"
77 # define PRIxLEAST32 "x"
78 # define PRIxLEAST64 __PRI64_PREFIX "x"
79
80 # define PRIxFAST8 "x"
81 # define PRIxFAST16 __PRIPTR_PREFIX "x"
82 # define PRIxFAST32 __PRIPTR_PREFIX "x"
83 # define PRIxFAST64 __PRI64_PREFIX "x"
84
85 //这里因该是大写16进制
86 /* UPPERCASE hexadecimal notation. */
87 # define PRIX8 "X"
88 # define PRIX16 "X"
89 # define PRIX32 "X"
90 # define PRIX64 __PRI64_PREFIX "X"
91
92 # define PRIXLEAST8 "X"
93 # define PRIXLEAST16 "X"
94 # define PRIXLEAST32 "X"
95 # define PRIXLEAST64 __PRI64_PREFIX "X"
96
97 # define PRIXFAST8 "X"
98 # define PRIXFAST16 __PRIPTR_PREFIX "X"
99 # define PRIXFAST32 __PRIPTR_PREFIX "X"
100 # define PRIXFAST64 __PRI64_PREFIX "X"
Windows：
/* fprintf macros for signed types */
#define PRId8 "d"
#define PRId16 "d"
#define PRId32 "d"
#define PRId64 "I64d"
#define PRIdLEAST8 "d"
#define PRIdLEAST16 "d"
#define PRIdLEAST32 "d"
#define PRIdLEAST64 "I64d"
#define PRIdFAST8 "d"
#define PRIdFAST16 "d"
#define PRIdFAST32 "d"
#define PRIdFAST64 "I64d"
#define PRIdMAX "I64d"
#define PRIdPTR "d"
#define PRIi8 "i"
#define PRIi16 "i"
#define PRIi32 "i"
#define PRIi64 "I64i"
#define PRIiLEAST8 "i"
#define PRIiLEAST16 "i"
#define PRIiLEAST32 "i"
#define PRIiLEAST64 "I64i"
#define PRIiFAST8 "i"
#define PRIiFAST16 "i"
#define PRIiFAST32 "i"
#define PRIiFAST64 "I64i"
#define PRIiMAX "I64i"
#define PRIiPTR "i"
#define PRIo8 "o"
#define PRIo16 "o"
#define PRIo32 "o"
#define PRIo64 "I64o"
#define PRIoLEAST8 "o"
#define PRIoLEAST16 "o"
#define PRIoLEAST32 "o"
#define PRIoLEAST64 "I64o"
#define PRIoFAST8 "o"
#define PRIoFAST16 "o"
#define PRIoFAST32 "o"
#define PRIoFAST64 "I64o"
#define PRIoMAX "I64o"
#define PRIoPTR "o"
/* fprintf macros for unsigned types */
#define PRIu8 "u"
#define PRIu16 "u"
#define PRIu32 "u"
#define PRIu64 "I64u"
#define PRIuLEAST8 "u"
#define PRIuLEAST16 "u"
#define PRIuLEAST32 "u"
#define PRIuLEAST64 "I64u"
#define PRIuFAST8 "u"
#define PRIuFAST16 "u"
#define PRIuFAST32 "u"
#define PRIuFAST64 "I64u"
#define PRIuMAX "I64u"
#define PRIuPTR "u"
#define PRIx8 "x"
#define PRIx16 "x"
#define PRIx32 "x"
#define PRIx64 "I64x"
#define PRIxLEAST8 "x"
#define PRIxLEAST16 "x"
#define PRIxLEAST32 "x"
#define PRIxLEAST64 "I64x"
#define PRIxFAST8 "x"
#define PRIxFAST16 "x"
#define PRIxFAST32 "x"
#define PRIxFAST64 "I64x"
#define PRIxMAX "I64x"
#define PRIxPTR "x"
#define PRIX8 "X"
#define PRIX16 "X"
#define PRIX32 "X"
#define PRIX64 "I64X"
#define PRIXLEAST8 "X"
#define PRIXLEAST16 "X"
#define PRIXLEAST32 "X"
#define PRIXLEAST64 "I64X"
#define PRIXFAST8 "X"
#define PRIXFAST16 "X"
#define PRIXFAST32 "X"
#define PRIXFAST64 "I64X"
#define PRIXMAX "I64X"
#define PRIXPTR "X"
/*
* fscanf macros for signed int types
* NOTE: if 32-bit int is used for int_fast8_t and int_fast16_t
* (see stdint.h, 7.18.1.3), FAST8 and FAST16 should have
* no length identifiers
*/
#define SCNd16 "hd"
#define SCNd32 "d"
#define SCNd64 "I64d"
#define SCNdLEAST16 "hd"
#define SCNdLEAST32 "d"
#define SCNdLEAST64 "I64d"
#define SCNdFAST16 "hd"
#define SCNdFAST32 "d"
#define SCNdFAST64 "I64d"
#define SCNdMAX "I64d"
#define SCNdPTR "d"
#define SCNi16 "hi"
#define SCNi32 "i"
#define SCNi64 "I64i"
#define SCNiLEAST16 "hi"
#define SCNiLEAST32 "i"
#define SCNiLEAST64 "I64i"
#define SCNiFAST16 "hi"
#define SCNiFAST32 "i"
#define SCNiFAST64 "I64i"
#define SCNiMAX "I64i"
#define SCNiPTR "i"
#define SCNo16 "ho"
#define SCNo32 "o"
#define SCNo64 "I64o"
#define SCNoLEAST16 "ho"
#define SCNoLEAST32 "o"
#define SCNoLEAST64 "I64o"
#define SCNoFAST16 "ho"
#define SCNoFAST32 "o"
#define SCNoFAST64 "I64o"
#define SCNoMAX "I64o"
#define SCNoPTR "o"
#define SCNx16 "hx"
#define SCNx32 "x"
#define SCNx64 "I64x"
#define SCNxLEAST16 "hx"
#define SCNxLEAST32 "x"
#define SCNxLEAST64 "I64x"
#define SCNxFAST16 "hx"
#define SCNxFAST32 "x"
#define SCNxFAST64 "I64x"
#define SCNxMAX "I64x"
#define SCNxPTR "x"
/* fscanf macros for unsigned int types */
//感觉这里是无符号
#define SCNu16 "hu"
#define SCNu32 "u"
#define SCNu64 "I64u"
#define SCNuLEAST16 "hu"
#define SCNuLEAST32 "u"
#define SCNuLEAST64 "I64u"
#define SCNuFAST16 "hu"
#define SCNuFAST32 "u"
#define SCNuFAST64 "I64u"
#define SCNuMAX "I64u"
#define SCNuPTR "u"
我感觉gcc这个源码没有Ubuntu哪个那么容易看懂，管他呢……用法是一样的
百度上的例子：
PRIi8、PRIu8、PRIo8以及PRIx8，其中i为有符号，u为无符号，o为8进制以及x为16进制。
百度上的代码：
#include <stdio.h>
#include <inttypes.h>
int main() {
int a = 5;
printf("a=%"PRIu64"\n", a);
return 0;
}
输出是啥我不太明白，感觉像是按位把int 拓展成了long long 导致出现了一个特别奇怪的数
我做了其他的测试
int a = 15;
printf("a=%"PRx8"\n", a);
输出的是 f
int a = 0xff;
printf("a=%"PRu8"\n", a);
输出的是255
嘿嘿，真是个进制转换的神器，不过好像没有二进制，而且只有常用的8和16，其他的还得自己写，这个库里还有其他功能，我先研究研究，日后再更新。（现在主要是防止自己忘记）
学习不易，诸君共勉！
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