存储在常量中的数据类型只可以是布尔型、数字型(rune、整型、浮点型和复数)和字符串型。 常量的定义格式为const identifier[type]=value,例如 const PI = 3.1415926 Go语言的常量定义可以限定常量类型,但不是必需的。如果定义常量时没有指定类型,那么它与字面常量一样,是无类型(untyped)常量。一个没有指定类型的常...
Println("size of bool=" , unsafe.Sizeof(bol)) 3、不支持类型强转 布尔类型和其它类型不一样,是不支持类型强转的,将一个整型赋值给布尔类型也会报错 代码语言:javascript 代码运行次数:0 运行 AI代码解释 var b bool // 编译会报错,cannot use 1 (type untyped int) as type bool in assignment b =...
# command-line-arguments GoProject/project03/demon09/main.go:8:18: cannot use'北'(untypedruneconstant21271) asbytevalue in variable declaration (overflows) 可以明显的看到,显示溢出了,所以在存储中文时,就需要使用较大的类型。 varchr3int='北'fmt.Printf("chr3=%c\n", chr3) ...
17 const ( 18 true = 0 == 0 // Untyped bool. 19 false = 0 != 0 // Untyped bool. 20 ) 21 22 // uint8 is the set of all unsigned 8-bit integers. 23 // Range: 0 through 255. 24 type uint8 uint8 25 26 // uint16 is the set of all unsigned 16-bit integers. 27 //...
If the type is a type parameter, the constant is converted into a non-constant value of the type parameter. An untyped constant has a default type which is the type to which the constant is implicitly converted in contexts where a typed value is required, for instance, in a short ...
fmt.Println(Sum(1.23,2.54));./main.go:33:18:cannot use1.23(untyped float constant)asint valueinargument toSum(truncated)./main.go:33:24:cannot use2.54(untyped float constant)asint valueinargument toSum(truncated) 所以,Golang开发者如果想开发一个类似实现2个float类型变量相加的功能,只能另写1个...
const ic = complex(0, c) // ic == 3.75i (untyped complex constant)const iΘ = complex(0, Θ) // iΘ == 1i (type complex128) 常量表达式的计算总是准确的;中间值和常量本身可能需要的精度远远大于语言中任何预声明类型所支持的精度。以下是合法声明 const Huge = 1 << 100 // Huge == ...
const Pi float64 = 3.14159265358979323846 const zero = 0.0 // untyped floating-point constant const ( size int64 = 1024 eof = -1 // untyped integer constant ) const a, b, c = 3, 4, "foo" // a = 3, b = 4, c = "foo", untyped integer and string constants const u, v float...
We do not want to interpret what untyped constants like 0 as their default type yet. Should it be a float32? uint8? A type T int? A ~int? That depends on the return type of the function the block is run from. Also there can be multiple different return types within a block as ...
(f), " untyped locals ", hex(frame.varp-size), "+", hex(size), "\n") throw("missing stackmap") } // Locals bitmap information, scan just the pointers in locals. if pcdata < 0 || pcdata >= stackmap.n { print("runtime: pcdata is ", pcdata, " and ", stackmap.n, " ...