C 语言printf打印各种数据类型的方法(u8/s8/u16/s16.../u64/double/float)(全)
生活随笔
收集整理的這篇文章主要介紹了
C 语言printf打印各种数据类型的方法(u8/s8/u16/s16.../u64/double/float)(全)
小編覺得挺不錯(cuò)的,現(xiàn)在分享給大家,幫大家做個(gè)參考.
首先必須知道u8,s8等數(shù)據(jù)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(jié)構(gòu)相關(guān)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;對于各種數(shù)據(jù)類型的打印方式總結(jié)如下如下:
| 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(jìn)制 | %0x |
| unsigned long/long---->十六進(jìn)制 | %0lx |
| long long/unsigned long long ----->十六進(jìn)制 | %0llx |
| unsigned int/int------>八進(jìn)制 | %0o |
| unsigned long/long---->八進(jìn)制 | %0lo |
| long long/unsigned long long ----->八進(jìn)制 | %0llo |
| float | %f |
| double | %f or %lf |
| 科學(xué)技術(shù)類型(必須轉(zhuǎn)化為double類型) | %e |
| 限制輸出字段寬度 | %x.yf (x:整數(shù)長度,y:小數(shù)點(diǎn)長度) |
待解問題,在linux kernel里面也有使用bool來定義變量,查看code,定義如下:
typedef _Bool bool;但是并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 */也大致解釋了linux kernel bool type了。
如果大家有興趣,可以掃碼關(guān)注我的個(gè)人公眾號(hào):
總結(jié)
以上是生活随笔為你收集整理的C 语言printf打印各种数据类型的方法(u8/s8/u16/s16.../u64/double/float)(全)的全部內(nèi)容,希望文章能夠幫你解決所遇到的問題。
- 上一篇: html在小的电脑屏幕字体缩小,网页的字
- 下一篇: OpenVINO2022.1+open_