How to define variable scope in Golang function?
Apr 11, 2024 pm 12:27 PM
In Go, function scope limits variable visibility to the function where the variable is declared: Declare a variable within a function: var name type = value Scope is limited to the declared code block, other functions or nested blocks These variables cannot be accessed
Function scope variable definition in Go
In Go, function scope determines the visibility of variables. Variables declared inside a function can only be accessed within that function.
Variable declaration
The way to declare variables in a function is as follows:
var name string = "Alice"
Among them:
varKeywords Indicates declaring a new variable.nameis the name of the variable.stringis the type of the variable.= "Alice"Initialize the value of the variable.
Scope
In Go, the scope of a variable is limited to the code block in which it is declared. This means that these variables cannot be accessed within other functions or nested blocks.
For example:
func main() {
age := 20
fmt.Println(age) // 輸出：20
}
func other() {
// age 未定義
fmt.Println(age) // 錯誤
}Practical case: Calculating the area of ??a triangle
In order to demonstrate the function scope, we write a function to calculate the area of ??a triangle:
func area(base, height float64) float64 {
// 定義局部變量面積
var area float64
// 計(jì)算三角形面積
area = 0.5 * base * height
return area
}
func main() {
// 在主函數(shù)中調(diào)用 area 函數(shù)并打印面積
fmt.Println(area(5.0, 10.0)) // 輸出：25.0
}In In the above example:
- Function
areadeclares a local variablearea. - Variable
areais valid in functionarea, but not in main functionmain. - Main function
mainUsefmt.Printlnto print the return value of theareafunction.
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