/// <summary>
/// 除法
/// </summary>
/// <param name="digitID"></param>
/// <param name="operandID"></param>
/// <returns></returns>
private List <int> GetDivisionInstance()
{
if (workList.Count <= 0)
{
return(null);
}
int index = Random.Range(0, workList.Count);
List <int> instance = workList[index];
int product = GetProduct(instance);
instance = Shuffle(instance);
instance.Insert(0, product);
workList.RemoveAt(index);
return(instance);
}
/// <summary>
/// 减法
/// </summary>
/// <param name="digitID"></param>
/// <param name="operandID"></param>
/// <returns></returns>
private List <int> GetSubtractionInstance()
{
List <int> instance = null;
int difference = 0;
int min = (int)Mathf.Pow(10, (int)CurCategoryInstance.digitID + 1);
int max = (int)Mathf.Pow(10, (int)CurCategoryInstance.digitID + 2);
do
{
instance = GetInstance(min, max, (int)CurCategoryInstance.operandID);
}while (CanDividedByTen(instance) || HasInstance(instance) || IsRepeat(instance) || !CanMinus(instance, min, out difference));
checkList.Add(instance);
int minuend = instance[0];
instance.RemoveAt(0);
instance = Shuffle(instance);
instance.Insert(0, minuend);
instance.Add(difference);
return(instance);
}
