go程序运行报错type *int in argument to demo
package main import "fmt" func demo(num *int) { fmt.Println(num) } func main() { var a int=5 demo(a) } 运行报错 # command-line-arguments ./te.go:90:6: cannot use a (type int) as type *int in a...
go程序中定义别名类型无法与原类型进行操作
代码如下 package main import "fmt" type myint int func main() { var a myint= 5 var b int =6 fmt.Println(a+b) } 运行报错 ./te.go:76:15: invalid operation: a + b (mismatched types myint and int)
go程序中通过代码无法区分函数与方法有啥不同
package main import ( "fmt" "math" ) type Vertex struct { X, Y float64 } func (v Vertex) Abs() float64 { return math.Sqrt(v.X*v.X + v.Y*v.Y) } func FABS(v Vertex) float64 { return math.Sqrt(...
go程序中通过方法修改struct不生效
package main import "fmt" type Info struct { Name string Age int } func (item Info)Update (value int) { item.Age=value } func main() { j:=Info{Name:"jyd",Age:19} j.Update(20) fmt.Println(j)...
go程序中for 循环range打印的值不正确
package main import "fmt" var pow = []int{1, 2, 4, 8, 16, 32, 64, 128} func main() { for item := range pow { fmt.Println(item) } } 运行结果 0 1 2 3 4 5 6 7 我的预期应该是 1 2 4 8 16 32 64 128
go程序中len 与cap的区别，搞不懂了
package main import "fmt" func main() { s := []int{2, 3, 5, 7, 11, 13} printSlice(s) s = s[:0] printSlice(s) s = s[:4] printSlice(s) s = s[2:] printSlice(s) } func printSlice(s []int)...
go程序报错invalid array index
package main import "fmt" func main() { var a [2]int a[0]=1 a[1]=2 a[2]=3 fmt.Println(a) } 运行报错 # command-line-arguments ./te.go:9:3: invalid array index 2 (out of bounds for 2-element arra...
go程序中defer执行顺序反了
package main import "fmt" func main() { defer fmt.Println("1") defer fmt.Println("2") defer fmt.Println("3") defer fmt.Println("4") fmt.Println("hello") } 运行结果 hello 4 3 2 1
go程序运行报错./te.go:14:9: undefined: v
package main import ( "fmt" "math" ) func pow(x, n, lim float64) float64 { if v := math.Pow(x, n); v = %g\n", v, lim) } return v } func main() { fmt.Println( pow(3, 2, 10), pow(3, 3, 20)...
go程序报错模块找不到，但是模块是安装过的
package main import "github.com/gin-gonic/gin" func main() { r := gin.Default() r.GET("/ping", func(c *gin.Context) { c.JSON(200, gin.H{ "message": "pong", }) }) r.Run() // listen and se...
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