public static KeyValuePair <string, string> GenerateQuestionAndAnswer(
IRandomNumberGenerator randomNumberGenerator, Rank rankToUse)
{
var numberRange = GetNumberRange(rankToUse);
var minValue = -numberRange;
var maxValue = numberRange + 1;
var firstItem = randomNumberGenerator.GetNumber(minValue, maxValue);
var secondItem = randomNumberGenerator.GetNumber(minValue, maxValue);
var answerItem = firstItem + secondItem;
var equationWithoutAnswer = $"{firstItem} + {secondItem} = ?";
var equationWithAnswer = $"{firstItem} + {secondItem} = {answerItem}";
return(new KeyValuePair <string, string>(equationWithoutAnswer, equationWithAnswer));
}
public Region RandomRegion(IRandomNumberGenerator randomNumberGenerator)
{
return(_regions[randomNumberGenerator.GetNumber(_regions.Count)]);
}