CalcToken

//Simple, but fun
//http://forum.unity3d.com/threads/160987-how-to-generate-operators-such-as-randomly.......can-we-use-random.range-...

using UnityEngine;
using System.Collections;

public class CalcTest : MonoBehaviour
{
    //untested
    public enum CalcToken { Add, Subtract }

    void Update()
    {
        if (!Input.GetKeyDown(KeyCode.Return)) return;
        var a = 5;
        var b = 10;
        var token = Random.Range(0, 2) == 0 ? CalcToken.Add : CalcToken.Subtract;
        var result = DoCalc(a, b, token);
        print(string.Format("a = {0}, b = {1}, token = {2}, result = {3}", a, b, token, result));
    }

    public float DoCalc(float a, float b, CalcToken token)
    {
        if (token == CalcToken.Add) return a + b;
        if (token == CalcToken.Subtract) return a - b;
        throw new System.NotImplementedException();
    }
}