Variables are fundamental building blocks in Go. Understanding their declaration, initialization, and default values is essential for effective programming. Go offers flexibility with shorthand syntax and multiple variable declarations, making it easier to write concise and readable code. ❮ PreviousNext ...
package main import"fmt"func main() {varwidth, heightint=100,50//declaring multiple variablesfmt.Println("width is", width,"height is", height) } 如果指定了初始值,则 type 可以省略。下面的程序利用类型推导声明了多个变量: package main import"fmt"func main() {varwidth, height =100,50//"int...
func main() { var age int = 29 // variable declaration with initial value fmt.Println("My age is", age) } 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 在上述程序中,age是类型的变量,int并且具有初始值29。上面的程序将打印以下输出。 My age is 29 1. 它显示年龄已经用值29初始化。 类型推...
Go shorthand multiple variable declarationWe can define multiple variables with the shorhand notation as well. shorthand.go package main import "fmt" func main() { name, age := "John Doe", 34 fmt.Printf("%s is %d years old\n", name, age) } The program declares two variables with the...
Multiple variables can be declared using a single statement. var name1, name2 type = initialvalue1, initialvalue2is the syntax for multiple variable declaration. 1packagemain23import"fmt"45funcmain(){6varprice,quantityint=5000,100//declaring multiple variables78fmt.Println("price is",price,"quant...
var age int // variable declaration fmt.Println("my age is", age) } 1. 2. 3. 4. 5. 6. 7. 8. 语句var age int 声明了一个类型为 int,名称为 age 的变量。在这里我们没有给它赋任何值。如果一个变量没有被赋予任何值,Go 会自动将这个变量初始化为其类型的 0值,比如这里的 age 将被赋值...
表示数组的元素、指向数组的指针、切片、字符串或可由x索引的map,值x分别被称为索引键或map键。以下规则适用 如果a不是map 索引x必须是整数类型或未定义类型的常量 常量索引必须是非负的,并且可以由int类型的值表示 非类型化的常量索引被赋予int类型 如果x取值超出[0, len(x) - 1]范围,则索引x越界 对于数组...
Specific error types has to be known for proper handling from multiple functions. The scope of which handler "catches" what error is not clear. #56126 - forces return from function without actually handling error. No custom error handling allowed. The magic handleErr function is unclear in ...
If an assignment requires multiple values on the left side, but one of the values will not be used by the program, a blank identifier on the left-hand-side of the assignment avoids the need to create a dummy variable and makes it clear that the value is to be discarded. For instance,...