public Formula Create()
{
int sum = 0;
int i;
FormulaOperator operation;
Formula formula = new Formula();
for (i = 0; i <= countOfOperations; i++)
{
if (i == 0)
{
operation = new FormulaOperator();
operation.Number = random.Next(numberRange.Min, numberRange.Max);
sum = sum + operation.Number;
formula.AddOperator(operation);
}
else
{
if (random.Next(0, 1) > 0)
{
operation = new FormulaOperator();
operation.Method = FormulaMethod.Addition;
operation.Number = random.Next(numberRange.Min, numberRange.Max);
sum = sum + operation.Number;
formula.AddOperator(operation);
CheckSum(ref sum, formula);
}
else
{
operation = new FormulaOperator();
operation.Method = FormulaMethod.Subtraction;
operation.Number = random.Next(numberRange.Min, numberRange.Max);
sum = sum - operation.Number;
formula.AddOperator(operation);
CheckSum(ref sum, formula);
}
}
}
formula.Result = sum;
return(formula);
}
protected virtual void GenerateFormulaArray(System.Collections.ArrayList list)
{
int i, k;
for (i = this.numberRange1.Min; i <= this.numberRange1.Max; i++)
{
for (k = this.numberRange2.Min; k <= this.numberRange2.Max; k++)
{
Formula formula = new Formula();
formula.AddOperator(FormulaOperator.NoneOperator(i));
formula.AddOperator(FormulaOperator.MultiplicationOperator(k));
formula.Result = i * k;
list.Add(formula);
}
}
}
protected override void GenerateFormulaArray(ArrayList list)
{
int i, k;
for (i = this.NumberRange1.Min; i <= this.NumberRange1.Max; i++)
{
for (k = this.NumberRange2.Min; k <= this.NumberRange2.Max; k++)
{
int leftValue = i * k;
Formula formula = new Formula();
formula.AddOperator(FormulaOperator.NoneOperator(leftValue));
formula.AddOperator(FormulaOperator.DivisionOperator(i));
formula.Result = k;
list.Add(formula);
}
}
}
/// <summary>
/// 检查结果是否在结果要求范围内
/// </summary>
/// <param name="sum"></param>
/// <param name="formula"></param>
private void CheckSum(ref int sum, Formula formula)
{
if (sum > resultRange.Max)
{
// 结果修正
int resultAmend = random.Next(sum - resultRange.Max + 1, sum);
formula.Operators[formula.Operators.Count - 1].Number -= resultAmend;
sum = sum - resultAmend;
formula.Result = sum;
}
if (sum < resultRange.Min)
{
// 结果修正
int resultAmend = random.Next(Math.Min(resultRange.Max * (-1), sum - 1)
, Math.Max(resultRange.Max * (-1), sum - 1));
FormulaOperator amendOper = new FormulaOperator();
if (resultAmend < 0)
{
amendOper.Method = FormulaMethod.Addition;
amendOper.Number = Math.Abs(resultAmend);
}
else
{
amendOper.Method = FormulaMethod.Subtraction;
amendOper.Number = Math.Abs(resultAmend);
}
FormulaOperator newOne = FormulaOperator.Combine(formula.Operators[formula.Operators.Count - 1], amendOper);
formula.Operators[formula.Operators.Count - 1] = newOne;
sum = sum - resultAmend;
formula.Result = sum;
}
}
