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path: root/verify.go
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package main

import (
	"fmt"
	"math"
	"math/rand"
	"time"
)

func init() {
	rand.Seed(time.Now().Unix())
}

var f = map[string]func(Element, Element) Element{
	"+": add,
	"-": sub,
	"*": times,
	"^": pot,
}

// verify perfoms tests
func verify(op string) (string, bool) {
	var mm, nn, rr int
	switch op {
	case "+":
		mm = rand.Intn(100)
		nn = rand.Intn(100)
		rr = mm + nn
	case "-":
		mm = rand.Intn(100)
		nn = rand.Intn(100)
		if nn > mm {
			mm, nn = nn, mm
		}
		rr = mm - nn
	case "*":
		mm = rand.Intn(10)
		nn = rand.Intn(10)
		rr = mm * nn
	case "^":
		mm = rand.Intn(10)
		nn = rand.Intn(3)
		rr = int(math.Pow(float64(mm), float64(nn)))
	}
	m := scan(mm)
	n := scan(nn)
	r := f[op](m, n)
	expected := scan(rr)
	ok := r.Value == expected.Value
	return fmt.Sprint(m, op, n, "=", r), ok
}

func verifyAll() {
	fmt.Println(verify("+"))
	fmt.Println(verify("-"))
	fmt.Println(verify("*"))
	fmt.Println(verify("^"))
}