public static MyFraction AddSubstractHandler(MyFraction num1, MyFraction num2, MathAction action)
{
// preparing output variable
MyFraction resultFraction = new MyFraction();
// creating variables which we can change later in the if statement
int newNominator1, newNominator2, newNominator, newDenominator;
// based on equality or unequality of denominators, their further calculations are different
if (num1.Denominator != num2.Denominator)
{
newNominator1 = num1.Nominator * num2.Denominator;
newNominator2 = num2.Nominator * num1.Denominator;
// the only difference between addition and substration is handled here by a ternary operator
newNominator = action == MathAction.ADD ? newNominator1 + newNominator2 : newNominator1 - newNominator2;
newDenominator = num1.Denominator * num2.Denominator;
resultFraction.Nominator = newNominator;
resultFraction.Denominator = newDenominator;
}
else
{
// ternary operator again
newNominator = action == MathAction.ADD ? num1.Nominator + num2.Nominator : num1.Nominator - num2.Nominator;
resultFraction.Nominator = newNominator;
resultFraction.Denominator = num1.Denominator;
}
return(resultFraction);
}
public static MyFraction ShortenFraction(MyFraction num)
{
// greatest common divisor
int gcd = Utils.FindGreatestCommonDivisor(num.Nominator, num.Denominator);
num.Nominator /= gcd;
num.Denominator /= gcd;
return(num);
}
public static MyFraction MathOperationHandler(MyFraction num1, MyFraction num2, MathAction action)
{
MyFraction output = new MyFraction();
switch (action)
{
case MathAction.ADD:
case MathAction.SUBSTRACT:
output = Utils.AddSubstractHandler(num1, num2, action);
break;
case MathAction.MULTIPLY:
case MathAction.DIVIDE:
output = Utils.MultiplyDivideHandler(num1, num2, action);
break;
default:
break;
}
return(output);
}
public static MyFraction MultiplyDivideHandler(MyFraction num1, MyFraction num2, MathAction action)
{
// preparing output variable
MyFraction resultFraction = new MyFraction();
// in case of division we simply reverse the second fraction
if (action == MathAction.DIVIDE)
{
int nominator = num2.Nominator;
int denominator = num2.Denominator;
num2.Denominator = nominator;
num2.Nominator = denominator;
}
resultFraction.Nominator = num1.Nominator * num2.Nominator;
resultFraction.Denominator = num1.Denominator * num2.Denominator;
// attempting to shorten the result fraction
resultFraction = Utils.ShortenFraction(resultFraction);
return(resultFraction);
}
// method for the delegate and event from the 4th task
public static void FractionChange(MyFraction fraction, int num)
{
Console.WriteLine("Change event fired");
}
// TESTING
public static void Main(string[] args)
{
// creating 2 fractions
MyFraction num1 = new MyFraction(1, 5);
MyFraction num2 = new MyFraction(5, 3);
// signing to the event from the 4th task
Console.WriteLine("Checking Change event:");
num1.Change += FractionChange;
num1.Nominator = 2;
num1.Denominator = 5;
Console.WriteLine("");
// checking getting a decimal from a fraction
Console.WriteLine($"A decimal from the first fraction: {Utils.GetDecimal(num1)}");
Console.WriteLine("");
// checking addition
MyFraction result1 = num1 + num2;
Console.WriteLine("Addition:");
Console.WriteLine(result1.Nominator);
Console.WriteLine("---");
Console.WriteLine(result1.Denominator);
Console.WriteLine("");
// checking substration
MyFraction result2 = num1 - num2;
Console.WriteLine("Substraction:");
Console.WriteLine(result2.Nominator);
Console.WriteLine("---");
Console.WriteLine(result2.Denominator);
Console.WriteLine("");
// checking multiplication and fraction shortening
MyFraction result3 = num1 * num2;
Console.WriteLine("Multiplication:");
Console.WriteLine(result3.Nominator);
Console.WriteLine("---");
Console.WriteLine(result3.Denominator);
Console.WriteLine("");
// checking division and fraction shortening
MyFraction result4 = num1 / num2;
Console.WriteLine("Division:");
Console.WriteLine(result4.Nominator);
Console.WriteLine("---");
Console.WriteLine(result4.Denominator);
Console.WriteLine("");
// indexer check
MyFraction num3 = new MyFraction(10, 35);
Console.WriteLine("Indexer checking:");
Console.WriteLine($"index 0 for num1: {num3[0]}");
Console.WriteLine($"index 1 for num1: {num3[1]}");
}
public static decimal GetDecimal(MyFraction num)
{
// nominator and denominator are of int type, that's why we have type convertion here
return(Math.Round((decimal)num.Nominator / (decimal)num.Denominator, 4));
}
