對於各種數據類型的打印方式總結如下如下：
| 數據類型 | 打印格式 |
|---|---|
| u8 | %d |
| s8 | %d |
| u16 | %d or %hu |
| s16 | %d or %hd |
| u32 | %u |
| s32 | %d |
| u64 | %llu |
| s64 | %lld |
| int | %d |
| unsigned int | %u |
| short int | %d or %hd |
| long | %ld |
| unsigned long | %lu |
| long long | %lld |
| unsigned long long | %llu |
| char | %c |
| char * | %s |
| bool (#define stdbool.h) | %d |
| unsigned int/int------>十六進制 | %0x |
| unsigned long/long---->十六進制 | %0lx |
| long long/unsigned long long ----->十六進制 | %0llx |
| unsigned int/int------>八進制 | %0o |
| unsigned long/long---->八進制 | %0lo |
| long long/unsigned long long ----->八進制 | %0llo |
| float | %f |
| double | %f or %lf |
| 科學技術類型(必須轉化爲double類型) | %e |
| 限制輸出字段寬度 | %x.yf (x:整數長度,y:小數點長度) |
必須知道u8,s8等數據類型的定義：
typedef signed char s8;
typedef unsigned char u8;
typedef signed short s16;
typedef unsigned short u16;
typedef signed int s32;
typedef unsigned int u32;
typedef signed long long s64;
typedef unsigned long long u64;
與體系結構相關的，定義在include/linux/type.h文件中：
/* bsd */
typedef unsigned char u_char;
typedef unsigned short u_short;
typedef unsigned int u_int;
typedef unsigned long u_long;
/* sysv */
typedef unsigned char unchar;
typedef unsigned short ushort;
typedef unsigned int uint;
typedef unsigned long ulong;
#ifndef __BIT_TYPES_DEFINED__
#define __BIT_TYPES_DEFINED__
typedef __u8 u_int8_t;
typedef __s8 int8_t;
typedef __u16 u_int16_t;
typedef __s16 int16_t;
typedef __u32 u_int32_t;
typedef __s32 int32_t;
#endif /* !(__BIT_TYPES_DEFINED__) */
typedef __u8 uint8_t;
typedef __u16 uint16_t;
typedef __u32 uint32_t;
#if defined(__GNUC__)
typedef __u64 uint64_t;
typedef __u64 u_int64_t;
typedef __s64 int64_t;
待解問題，在linux kernel裏面也有使用bool來定義變量，查看code，定義如下：
typedef _Bool bool;
但是並沒有真正找到具體定義在何處，待解。下面是stdbool.h的source code：
#define _STDBOOL_H
#ifndef __cplusplus
#define bool _Bool
#define true 1
#define false 0
#else /* __cplusplus */
/* Supporting _Bool in C++ is a GCC extension. */
#define _Bool bool
#if __cplusplus < 201103L
/* Defining these macros in C++98 is a GCC extension. */
#define bool bool
#define false false
#define true true
#endif
#endif /* __cplusplus */
/* Signal that all the definitions are present. */
#define __bool_true_false_are_defined 1
#endif /* stdbool.h */
————————————————
版權聲明：本文爲CSDN博主「悟空明鏡」的原創文章，遵循 CC 4.0 BY-SA 版權協議，轉載請附上原文出處鏈接及本聲明。
原文鏈接：https://blog.csdn.net/wukongmingjing/article/details/81709429
