Possible Internal rounding of small floats

Unity Engine
1

I’m having issues with some of my code:

using System;
using System.Collections;
using UnityEngine;
using UnityEngine.UI;

public class TimeController : MonoBehaviour {
    [HideInInspector]
    public float money;

    public float earningsMultiplier = 1;
    public float timeBetweenSaves = 10;

    public Text t;
  
    TimeSpan timeDifference;

    private void Start()
    {
        timeDifference = DateTime.UtcNow - DateTime.Parse(PlayerPrefs.GetString("lastSavedTimeAndDate"));
        PlayerPrefs.SetString("totalMoney", (getCurrentMoney() + timeDifference.TotalSeconds * earningsMultiplier).ToString());
      
        InvokeRepeating("SaveDataPeriodically",timeBetweenSaves, timeBetweenSaves);

        money = getCurrentMoney();
    }

    private void Update()
    {
        money += Time.deltaTime * earningsMultiplier;
        PlayerPrefs.SetString("totalMoney", money.ToString());

        //Keep last saved time up to date (HA! Unintentional puns rule XD!)
        PlayerPrefs.SetString("lastSavedTimeAndDate", DateTime.UtcNow.ToString());

        t.text = "Current Credits: " + money.ToString();
    }

    IEnumerator SaveDataPeriodically() { PlayerPrefs.Save(); return null; }

    public float getCurrentMoney() { return float.Parse(PlayerPrefs.GetString("totalMoney")); }
    public void PurchaseItem(float cost) { money -= cost; }
    public bool CanAfford(float unitCost) { if (money >= unitCost) { return true; } return false; }
}

The issue seems to be this line here:

money += Time.deltaTime * earningsMultiplier;

For some reason, it seems to be rounding Time.deltaTime * earningsMultiplier to zero if I set earningsMultiplier to something smaller than 1. Even 0.9 seems to bug out a bit. Does anyone know why it would be rounding this? Money is supposed to increment over time (This is code for something similar to a cookie clicker game where money increments over time), but at the moment due to this bug it stays where it is if the multiplier is small enough. I cannot continue my game until this bug is sorted. Any suggestions are welcome :slight_smile:

Edit: It does not round Time.deltaTime * earningsMultiplier to zero. Instead, it just doesn’t add the tiny value of Time.deltaTime * earningsMultiplier to money for some reason. E.g. 300,000.7 + 0.00016 = 300,000.7 according to unity. You can see where the bug occurs. Yet, for example, 300,000.7 + 0.016 = 300,000.716

2

Check the Single.ToString format section: https://docs.microsoft.com/en-us/dotnet/api/system.single.tostring?view=netframework-4.8
Only the text where you were using ToString() should be affected BTW.

3

I’ve tested that, but even when I put out to the console it still has the same issue.

4

Tested what? Did you try the

money.ToString("G", CultureInfo.InvariantCulture);