//****************************************************************************************************
public override NumVar sub(NumVar b) {
if (b.IsInt())
return new IntVar(this.m_val - ((IntVar) b).Val);
else if (b.IsReal()) {
try {
return new RealVar((double) this.m_val - ((RealVar) b).Val);
}
catch (System.SystemException) {
throw new CalcException("ќшибка в вычислени¤х.");
}
}
else
return null;
}
