private static void GenerateExerciseAdd (out int number1, out char oper, out int number2, out int result,
out ValidQuestions validQuestions)
{
oper = '+';
validQuestions = ValidQuestions.All;
number1 = RandomNumber (addMaximum + 1);
number2 = RandomNumber (addMaximum + 1 - number1);
result = number1 + number2;
}
private static void GenerateExerciseDivide (out int number1, out char oper, out int number2, out int result,
out ValidQuestions validQuestions)
{
oper = ':';
validQuestions = ValidQuestions.All;
int len = multiplicationTables.Length;
int number = RandomNumber (multiplicationMaximum + 1);
int table = multiplicationTables [RandomNumber (len)];
int product = number * table;
switch (random.Next (2)) {
case 0: // product : table = number
number1 = product;
number2 = table;
result = number;
break;
case 1: // product : number = table
number1 = product;
number2 = number;
result = table;
break;
default:
throw new ApplicationException ();
}
if (number1 == 0)
validQuestions &= ~ValidQuestions.Number2;
if (number2 == 0)
validQuestions = ValidQuestions.None;
}
