Golang: unused functions

Question content

I recently started learning golang, and for some strange reasons, even if I use a function in the code, vscode says that the function Not used, the code is as follows:

package prime  

import (
    "fmt"
)

func test(a int) (int) {

    to_ret := 1

    for i := 2; i < a; i++ {
        if a % i == 0 {
            to_ret = 0
        }
    }
    return to_ret
}

func main() {
    sum := 2
    for i := 4; i < 1000001; i++ {
        sum = sum + test(i)
    }
    fmt.Println(sum)
}

The syntax is correct, but the program still won't run.

Correct answer

https://www.php.cn/link/4219840f5b401ebe7639efe00a1fb982

Create a complete program by transitively linking a single unimported package called the main package with all its imported packages. The main package must have the package name main and declare a function main that takes no parameters and returns no value.

func main() { … }

Program execution first initializes the main package, and then calls the main function. When this function call returns, the program exits. It does not wait for other (non-master) goroutines to complete.

Change the package name to main:

package main

import (
    "fmt"
)

func test(a int) int {

    to_ret := 1

    for i := 2; i < a; i++ {
        if a%i == 0 {
            to_ret = 0
        }
    }
    return to_ret
}

func main() {
    sum := 2
    for i := 4; i < 1000001; i++ {
        sum = sum + test(i)
    }
    fmt.Println(sum)
}

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