Golang FMT format "placeholder"

Source: Internet
Author: User

Golang's FMT package implements formatted I/O functions, similar to the C printf and scanf.

# 定义示例类型和变量type Human struct {    Name string}var people = Human{Name:"zhangsan"}

Common placeholder

占位符     说明                           举例                   输出%v      相应值的默认格式。            Printf("%v", people)   {zhangsan},%+v     打印结构体时,会添加字段名     Printf("%+v", people)  {Name:zhangsan}%#v     相应值的Go语法表示            Printf("#v", people)   main.Human{Name:"zhangsan"}%T      相应值的类型的Go语法表示       Printf("%T", people)   main.Human%%      字面上的百分号,并非值的占位符  Printf("%%")            %

Boolean placeholder

占位符       说明                举例                     输出%t          true 或 false。     Printf("%t", true)       true

Integer placeholders

占位符     说明                                  举例                       输出%b      二进制表示                             Printf("%b", 5)             101%c      相应Unicode码点所表示的字符              Printf("%c", 0x4E2D)        中%d      十进制表示                             Printf("%d", 0x12)          18%o      八进制表示                             Printf("%d", 10)            12%q      单引号围绕的字符字面值,由Go语法安全地转义 Printf("%q", 0x4E2D)        '中'%x      十六进制表示,字母形式为小写 a-f         Printf("%x", 13)             d%X      十六进制表示,字母形式为大写 A-F         Printf("%x", 13)             D%U      Unicode格式:U+1234,等同于 "U+%04X"   Printf("%U", 0x4E2D)         U+4E2D

Components of floating-point numbers and complex numbers (real and imaginary parts)

占位符     说明                              举例            输出%b      无小数部分的,指数为二的幂的科学计数法,        与 strconv.FormatFloat 的 'b' 转换格式一致。例如 -123456p-78%e      科学计数法,例如 -1234.456e+78        Printf("%e", 10.2)     1.020000e+01%E      科学计数法,例如 -1234.456E+78        Printf("%e", 10.2)     1.020000E+01%f      有小数点而无指数,例如 123.456        Printf("%f", 10.2)     10.200000%g      根据情况选择 %e 或 %f 以产生更紧凑的(无末尾的0)输出 Printf("%g", 10.20)   10.2%G      根据情况选择 %E 或 %f 以产生更紧凑的(无末尾的0)输出 Printf("%G", 10.20+2i) (10.2+2i)

String and byte slices

占位符     说明                              举例                           输出%s      输出字符串表示(string类型或[]byte)   Printf("%s", []byte("Go语言"))  Go语言%q      双引号围绕的字符串,由Go语法安全地转义  Printf("%q", "Go语言")         "Go语言"%x      十六进制,小写字母,每字节两个字符      Printf("%x", "golang")         676f6c616e67%X      十六进制,大写字母,每字节两个字符      Printf("%X", "golang")         676F6C616E67

Pointer

占位符         说明                      举例                             输出%p      十六进制表示,前缀 0x          Printf("%p", &people)             0x4f57f0

Other marks

占位符      说明                             举例          输出+      总打印数值的正负号;对于%q(%+q)保证只输出ASCII编码的字符。                                            Printf("%+q", "中文")  "\u4e2d\u6587"-      在右侧而非左侧填充空格(左对齐该区域)#      备用格式:为八进制添加前导 0(%#o)      Printf("%#U", '中')      U+4E2D       为十六进制添加前导 0x(%#x)或 0X(%#X),为 %p(%#p)去掉前导 0x;       如果可能的话,%q(%#q)会打印原始 (即反引号围绕的)字符串;       如果是可打印字符,%U(%#U)会写出该字符的       Unicode 编码形式(如字符 x 会被打印成 U+0078 'x')。' '    (空格)为数值中省略的正负号留出空白(% d);       以十六进制(% x, % X)打印字符串或切片时,在字节之间用空格隔开0      填充前导的0而非空格;对于数字,这会将填充移到正负号之后
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