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public class Quantity
{
decimal amount;
UnitOfMeasure unit;
public Quantity(decimal amount, UnitOfMeasure unit)
{
this.amount = amount;
this.unit = unit;
}
public Quantity convert_to(UnitOfMeasure unit)
{
return new Quantity(unit.convert(this.amount, this.unit), unit);
}
public Quantity plus(Quantity other)
{
var converted = other.convert_to(this.unit);
return new Quantity(this.amount + converted.amount, this.unit);
}
public Quantity subtract(Quantity other)
{
var converted = other.convert_to(this.unit);
return new Quantity(this.amount - converted.amount, this.unit);
}
public bool Equals(Quantity other)
{
if (ReferenceEquals(null, other)) return false;
if (ReferenceEquals(this, other)) return true;
return other.amount.Equals(amount) && Equals(other.unit, unit);
}
public override bool Equals(object obj)
{
if (ReferenceEquals(null, obj)) return false;
if (ReferenceEquals(this, obj)) return true;
if (obj.GetType() != typeof (Quantity)) return false;
return Equals((Quantity) obj);
}
public override int GetHashCode()
{
unchecked
{
return (amount.GetHashCode()*397) ^ (unit != null ? unit.GetHashCode() : 0);
}
}
public override string ToString()
{
return this.amount.ToString() + " " + this.unit.ToString();
}
}
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