I have recently started learning golang and for some strange reason even if I use a function in the code viscose says that the function is unused, here’s the code:
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 right, but still the program doesn’t work
>Solution :
https://go.dev/ref/spec#Program_execution
A complete program is created by linking a single, unimported package called the main package with all the packages it imports, transitively. The main package must have package name main and declare a function main that takes no arguments and returns no value.
func main() { … }Program execution begins by initializing the main package and then invoking the function main. When that function invocation returns, the program exits. It does not wait for other (non-main) 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)
}