Как объявить переменные для чисел, операторов и результатов в Go?

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package main

import "fmt"

func main() {
    var number1, number2, result int
    var operator string

    number1 = 10
    number2 = 5
    operator = "+"

    if operator == "+" {
        result = number1 + number2
    } else if operator == "-" {
        result = number1 - number2
    } else if operator == "*" {
        result = number1 * number2
    } else if operator == "/" {
        result = number1 / number2
    }

    fmt.Printf("%d %s %d = %d
", number1, operator, number2, result)
}