ionicwang2楼•4 个月前h6919382073楼•4 个月前itying8884楼•4 个月前sinazl5楼•4 个月...
在Golang中,有两种常量,分别是: 未定类常量(Untyped Constant) 定类常量(Typed Constant) 下面一一介绍～ 未定类常量 声明时未提供类型的常量就是未定类常量(Untyped Constant),比如: 未定类常量具有弹性(flexibility),在可兼容的类型之间转换无需显式转换 如果把换成将会报错: 在内置包里,声明了一组未定类常...
constdelta =1// untyped constant, default type is intvarnumint64num += delta AI代码助手复制代码 如果我们把const换成var,代码无法编译,会爆出这种错误:invalid operation: num + delta (mismatched types int64 and int)。 但为什么常量可以呢?这就是Representability或者说类型自动匹配在捣鬼。 按照官方的解释...
packagemainimport("fmt""unsafe")funcmain(){// 超出了int8存储范围,编译报错: cannot use 222 (untyped int constant) as int8 value in variable declaration (overflows)// var n1 int8 = 222// fmt.Println(n1)// 超出了uint8的存储范围,编译报错: cannot use -22 (untyped int constant) as uint...
// var num int8 = 128 cannot use 128 (untyped int constant) as int8 value in variable declaration (overflows) var num1 uint8 = 128 fmt.Print(num1) var num2 uint16 = 228 fmt.Print(num2) var num3 uint32 = 328 fmt.Print(num3) ...
n8) //编译不会报错,但是20+127=147超过了int8的取值范围,所以数据会溢出 //var n9 int8 = int8(n7) + 128 //定义n9的类型为int8,将n7的值先转为int8,然后执行相加操作 //fmt.Println("n9的值为: ", n9) //编译报错“128 (untyped int constant) overflows int8”,因为128已经大于了int8的...
// 超出了uint8的存储范围,编译报错: cannot use -22(untypedintconstant)asuint8valueinvariable declaration (overflows) //varn2uint8= -22// fmt.Println(n2) //Golang的整数类型,默认声明为int类型。varn3 =100fmt.Printf("n3的类型是: %T\n",n3) ...
.\test.go:11:9: cannot use 1 (untyped int constant) as string value in assignment > Elapsed: 0.561s > Result: Error 1. 2. 3. 4. 5. 最后,声明了变量就需要使用,如果不用,那么声明的意义在哪儿呢? func main() { var a string = "abc" ...
package foo import "fmt" func Foo() { const foo = 0xff000000 fmt.Printf("%v", foo) } $ gomobile bind -target android . foo.go:7:19: cannot use foo (untyped int constant 4278190080) as int value in argument to fmt.Printf (overflows) ...
# command-line-arguments .\test.go:11:9: cannot use 1 (untyped int constant) as string va...