Possible Internal rounding of small floats

I'm having issues with some of my code:

Code (CSharp):

1. using System;
2. using System.Collections;
3. using UnityEngine;
4. using UnityEngine.UI;
5.  
6. public class TimeController : MonoBehaviour {
7.     [HideInInspector]
8.     public float money;
9.  
10.     public float earningsMultiplier = 1;
11.     public float timeBetweenSaves = 10;
12.  
13.     public Text t;
14.  
15.     TimeSpan timeDifference;
16.  
17.     private void Start()
18.     {
19.         timeDifference = DateTime.UtcNow - DateTime.Parse(PlayerPrefs.GetString("lastSavedTimeAndDate"));
20.         PlayerPrefs.SetString("totalMoney", (getCurrentMoney() + timeDifference.TotalSeconds * earningsMultiplier).ToString());
21.      
22.         InvokeRepeating("SaveDataPeriodically",timeBetweenSaves, timeBetweenSaves);
23.  
24.         money = getCurrentMoney();
25.     }
26.  
27.     private void Update()
28.     {
29.         money += Time.deltaTime * earningsMultiplier;
30.         PlayerPrefs.SetString("totalMoney", money.ToString());
31.  
32.         //Keep last saved time up to date (HA! Unintentional puns rule XD!)
33.         PlayerPrefs.SetString("lastSavedTimeAndDate", DateTime.UtcNow.ToString());
34.  
35.         t.text = "Current Credits: " + money.ToString();
36.     }
37.  
38.     IEnumerator SaveDataPeriodically() { PlayerPrefs.Save(); return null; }
39.  
40.     public float getCurrentMoney() { return float.Parse(PlayerPrefs.GetString("totalMoney")); }
41.     public void PurchaseItem(float cost) { money -= cost; }
42.     public bool CanAfford(float unitCost) { if (money >= unitCost) { return true; } return false; }
43. }
44.  

The issue seems to be this line here:

Code (CSharp):

1. 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

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

 

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.

 

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

 

Tested what? Did you try the

Code (CSharp):

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