string-format-go

path: courses/go-course/string-format-go.md

- **fileName**: string-format-go
- **Created on**: 2024-08-23 20:20:38

String Format Specifiers in Go

Format Specifier	Description	Example	Output
`%v`	Default format (any value)	`fmt.Printf("%v", 123)`	`123`
`%+v`	Adds field names to structs	`fmt.Printf("%+v", struct { Name string }{"Alice"})`	`{Name:Alice}`
`%#v`	Go-syntax representation	`fmt.Printf("%#v", struct { Name string }{"Alice"})`	`struct { Name string }{Name:"Alice"}`
`%T`	Type of the value	`fmt.Printf("%T", 123)`	`int`
`")`	`%`
`%t`	Boolean	`fmt.Printf("%t", true)`	`true`
`%b`	Binary representation	`fmt.Printf("%b", 5)`	`101`
`%c`	Character (rune)	`fmt.Printf("%c", 65)`	`A`
`%d`	Decimal integer	`fmt.Printf("%d", 123)`	`123`
`%o`	Octal integer	`fmt.Printf("%o", 123)`	`173`
`%x`	Hexadecimal (lowercase)	`fmt.Printf("%x", 255)`	`ff`
`%X`	Hexadecimal (uppercase)	`fmt.Printf("%X", 255)`	`FF`
`%e`	Scientific notation (lowercase)	`fmt.Printf("%e", 1234.5678)`	`1.234568e+03`
`%E`	Scientific notation (uppercase)	`fmt.Printf("%E", 1234.5678)`	`1.234568E+03`
`%f`	Floating-point number	`fmt.Printf("%f", 1234.5678)`	`1234.567800`
`%.2f`	Floating-point with 2 decimals	`fmt.Printf("%.2f", 1234.5678)`	`1234.57`
`%g`	Shortest representation (%e or %f)	`fmt.Printf("%g", 1234.5678)`	`1234.5678`
`%G`	Shortest representation (%E or %f)	`fmt.Printf("%G", 1234.5678)`	`1234.5678`
`%s`	String	`fmt.Printf("%s", "hello")`	`hello`
`%q`	Double-quoted string with escapes	`fmt.Printf("%q", "hello")`	`"hello"`
`%p`	Pointer address	`fmt.Printf("%p", &[]int{1, 2, 3})`	`0xc00000a0b0`
`%U`	Unicode format: U+1234	`fmt.Printf("%U", 'A')`	`U+0041`