Unity3D class used for health bars and anything else that has a min / max.

StatRange.cs

using UnityEngine;
using System.Collections;

public class StatRange {

    public int min { get; set; }
    public int max { get; set; }
    public int value { get; set; }

    public StatRange(int min = 0, int max = 0) {
        this.max = max;
        this.min = min;
    }

    public void Reset() {
        value = max;
    }

    public float Percent {
        get { return (float)value / max; }
        set { this.value = (int)((float)max * value); }
    }

    public void Add(int val) {
        value += val;
        Clamp();
    }

    public void Minus(int val) {
        value -= val;
        Clamp();
    }

    public void Clamp() {
        value = Mathf.Clamp(value, min, max);
    }

    public bool IsMin {
        get { return value == min; }
    }

    public bool IsMax {
        get { return value == max; }
    }
}