/* @brief Loads numbers from input, accumulates their sum, sum of their squares and their count; calculated standard deviation and prints it
*/
private static int Main(string[] args)
{
MathComponents math = new MathComponents();
bool conversionSuccessful;
string input;
decimal square = 0;
decimal linearAccumulator = 0;
decimal quadraticAccumulator = 0;
int count = 0;
while (!string.IsNullOrEmpty(input = Console.ReadLine()))
{
conversionSuccessful = Decimal.TryParse(input, out decimal currentNumber);
if (!conversionSuccessful)
{
Console.WriteLine("Conversion error");
return(-1);
}
count++;
linearAccumulator = CheckNull(math.Add(linearAccumulator, currentNumber));
square = CheckNull(math.Exponentiate(currentNumber, 2));
quadraticAccumulator = CheckNull(math.Add(quadraticAccumulator, square));
}
if (count < 2)
{
Console.WriteLine("Minimum of 2 numbers required");
return(-1);
}
decimal average = CheckNull(math.Divide(1, count));
average = CheckNull(math.Multiply(average, linearAccumulator));
decimal deviationLeft = CheckNull(math.Subtract(count, 1));
deviationLeft = CheckNull(math.Divide(1, deviationLeft));
decimal deviationRight = CheckNull(math.Exponentiate(average, 2));
deviationRight = CheckNull(math.Multiply(count, deviationRight));
deviationRight = CheckNull(math.Subtract(quadraticAccumulator, deviationRight));
decimal deviation = CheckNull(math.Multiply(deviationLeft, deviationRight));
deviation = CheckNull(math.Root(2, deviation));
/* DEBUG INFO
* Console.WriteLine("N: " + count);
* Console.WriteLine("sum x: " + linearAccumulator);
* Console.WriteLine("sum x^2: " + quadraticAccumulator);
* Console.WriteLine("average x: " + average);
* // END INFO */
Console.WriteLine(deviation);
//Console.ReadLine();
return(0);
}
/**
* @brief Tests to check subtracion functionality
* @brief testing if length is max 9 significant digits
*/
public void TestSubtraction()
{
// no mathematical rules for subtraction
MathComponents NewMath = new MathComponents();
// tests to check subtracion functionality
decimal?result = NewMath.Subtract(1, 1);
Assert.AreEqual(0, result);
result = NewMath.Subtract(0, 0);
Assert.AreEqual(0, result);
result = NewMath.Subtract(1, 1);
Assert.AreEqual(0, result);
result = NewMath.Subtract(12, -12);
Assert.AreEqual(24, result);
result = NewMath.Subtract(5, 0.55m);
Assert.AreEqual(4.45m, result);
result = NewMath.Subtract(-3.00m, -3.00m);
Assert.AreEqual(0, result);
result = NewMath.Subtract(5.47m, 2.47m);
Assert.AreEqual(3, result);
result = NewMath.Subtract(-3.25478m, -0.25478m);
Assert.AreEqual(-3, result);
// test length of returning value (max 9 significant digits)
result = NewMath.Subtract(0.58647m, 5.78952411m);
Assert.AreEqual(RoundOff(-5.20305411m), result);
result = NewMath.Subtract(1115475465, 1115475465);
Assert.AreEqual(RoundOff(0), result);
result = NewMath.Subtract(5687412.85m, 85456297);
Assert.AreEqual(RoundOff(-79768884.15m), result);
result = NewMath.Subtract(9652145.2m, -9912.4567m);
Assert.AreEqual(RoundOff(9662057.6567m), result);
result = NewMath.Subtract(0.99999999m, -0.99999999m);
Assert.AreEqual(RoundOff(1.99999998m), result);
// test error handling
result = NewMath.Subtract(999287952, -999514265);
Assert.AreEqual(null, result);
result = NewMath.Subtract(900000000, -900000000);
Assert.AreEqual(null, result);
}