Learn the parameters and return values ​​of Go language functions

Learn the parameters and return values ​​of Go language functions

In Go language, function is an important programming element, which is used to encapsulate a set of operations and data processing logic. The parameters and return value of a function are important parts of the function. By properly designing the parameters and return value, the function can be made more flexible and powerful.

1. Function parameters

In the Go language, a function can have zero or more parameters, and the type of the parameters is specified after the parameter name. Here is a simple example:

package main

import "fmt"

func add(x int, y int) int {
    return x + y
}

func main() {
    result := add(10, 20)
    fmt.Println(result)
}

In the above example, the add function accepts two parameters of type int x and y, and return their sum. When calling the add function in the main function, specific parameter values ​​are passed in, and the result is finally printed.

2. Return value

In Go language, a function can have one or more return values. If a function has only one return value, then only the type of the return value needs to be specified in the function signature. Here is an example:

package main

import "fmt"

func divide(x float64, y float64) float64 {
    if y == 0 {
        return 0.0
    }
    return x / y
}

func main() {
    result := divide(10.0, 2.0)
    fmt.Println(result)
}

In the above example, the divide function accepts two parameters of type float64 x and y , and return their quotient. If y is 0, return 0. Call the divide function in the main function and print the return value.

3. Multiple return values

Function in Go language can return multiple values. Here is an example:

package main

import "fmt"

func swap(x, y string) (string, string) {
    return y, x
}

func main() {
    a, b := swap("hello", "world")
    fmt.Println(a, b)
}

In the above example, the swap function accepts two parameters of type string x and y , and return the two strings with their values ​​exchanged. Call the swap function in the main function, and use two variables to receive the return value, and finally print out the exchanged result.

Through the above example, we can see how the parameters and return values ​​of functions are used in the Go language. Reasonable design of function parameters and return values ​​can make the function more flexible and versatile, and improve the reusability and readability of the code. I hope the above content will be helpful to learn the parameters and return values ​​of Go language functions.

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