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Question by Kacer · Aug 30, 2012 at 08:56 AM · errorlooponguiforeach

Not able to make a foreach loop

Hey

I'm trying to make a "lives left" functionality for my game, you know, the standard 3 lives in the right corner of the screen.

Thing is though, every time i try to make a foreach loop i get an error thrown in my face:

error CS1579: foreach statement cannot operate on variables of type `int' because it does not contain a definition for `GetEnumerator' or is not accessible

The code i'm using is looking like this:

 using UnityEngine;    
 using System.Collections;
 
 public class UserInterface : MonoBehaviour {
     
     public int livesleft = 3;
     
     void OnGUI(){
         GUILayout.BeginArea(new Rect(Screen.width - 170,20,50,170));
         foreach(int i in livesleft){
             Debug.Log("i dont work");
         }
         GUILayout.EndArea();
     }
 }

The error is not only limited to the OnGUI function, it doesnt work in update either.

I'm about to go flip a table over this, because i have no idea what im doing wrong.

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avatar image Fattie · Aug 30, 2012 at 12:54 PM 1
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what you're looking for there champ is

 for ( var count:int=0; count<livesleft; ++count ) doSomething();

when I gotta make objective-c, I always build up a macro

 doThis$$anonymous$$anyTimes( n )

in this example you would simply say

 doThis$$anonymous$$anyTimes( livesleft )

I$$anonymous$$O this is the most-needed control structure that is commonly missing from programming languages!

It's annoying that most languages contain toss like "switch()" that are crap and if anything you should avoid, but they don't have a simple "doThis$$anonymous$$anyTimes" structure ... bearing in mind that, say, 50% of the time when you use "for..." you're actually just doing a "doThis$$anonymous$$anyTimes()" structure.

This concludes today's language gripes interlude.

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Answer by nicloay · Aug 30, 2012 at 09:45 AM

livesleft must be an some type of array which implement IEnumerator Interface, not an a primitive like an int,

in your case you can use following construction

 while ( --livesleft >0){
     Debug.Log("blalblalbla");
 }

 
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avatar image Kryptos · Aug 30, 2012 at 11:34 AM 0
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Not IEnumerator but IEnumerable.

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Answer by Kryptos · Aug 30, 2012 at 11:36 AM

The foreach statement is used to iterate through a collection that implements the IEnumerable interface. You cannot use it with other types.

Here you can learn how the foreach loop works:

  1. foreach, in (C# Reference)

  2. C# Foreach (dotnetperls)

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