Problems with float in for

Questions & Answers
1

I make a simple code to show my problem. I have to increment a variable in 0.2f, but sometimes increases with another presision.
I don`t understand why it happens. Here is my code:

public class Test : MonoBehaviour {

public static float areaDeMovimiento = 4.0f;//2m
public static int cantCubitos = 20;
private static float size = areaDeMovimiento/cantCubitos;
	
// Use this for initialization
void Start () {
for(float i = 0; i < areaDeMovimiento; i += size) 
	{
		print(i + "---" + size);
		for(float j = 0; j < areaDeMovimiento; j+= size)
		{
			//:S
		}
	}
}

// Update is called once per frame
void Update () {
	

}
}

And heres is my output:

alt text

2

If you only require a single digit of precision, it’s best to work in Integers, and divide by 10.

3

Thanks JTBBentley, it’s a good idea but i need float or double precision.
I changed all float by doubles and I found the same error:

Here is my code:

public class Test : MonoBehaviour {

public static double areaDeMovimiento = 4d;//2m
public static int cantCubitos = 20;
private static double size = areaDeMovimiento/cantCubitos;
	
// Use this for initialization
void Start () {
	for(double i = 0; i < areaDeMovimiento; i += size) 
	{
		print("I:" + i + " --- A:" + (areaDeMovimiento*0.5d)+ " --- R" 
			+ (i-(areaDeMovimiento*0.5d)) + "---" + size);
	}
}

// Update is called once per frame
void Update () {
	

}
}

And heres is my output: http://i41.tinypic.com/sxg9d5.png

125alt text125