小编404*_*und的帖子

package main

import (
    "errors"
    "fmt"
)

type FieldElement struct {
    Num   int
    Prime int
}

func (el *FieldElement) Add(o FieldElement) (FieldElement, error) {
    if el.Prime != o.Prime {
        return FieldElement{}, errors.New("cannot operate on two numbers in different Fields")
    }
    return FieldElement{(el.Num + o.Num) % el.Prime, el.Prime}, nil
}

// Sub, Mul, Div and Pow also members of FieldElement returning (FieldElement, error)

func main() {
    a := FieldElement{13, 19}
    b := FieldElement{9, 19}
    fmt.Println(a.Add(b))
}

type Point struct {
    X …