What actions need to be performed for the returned value to be added to the call stack?

In Go, to add a function's return value to the call stack, you must explicitly use the return statement with that value. When a function is called, its return value is placed on the call stack, from where the calling code can retrieve it.

Example:

func add(a int, b int) int {
    return a + b // the return value is added to the call stack
}

func main() {
    result := add(2, 3) // result will get the value from the call stack
    fmt.Println(result)  // output: 5
}

Without the return statement, the value will not be returned and will not be placed on the call stack.