public static void Main(string[] args)
{
Console.Write("Please select the task(1-11): ");
int taskNumber;
while (true)
{
try
{
taskNumber = int.Parse(Console.ReadLine());
if (taskNumber < 1 || taskNumber > 12)
{
throw new FormatException();
}
break;
}
catch (FormatException)
{
Console.Write("Incorrect input, try again: ");
}
}
switch (taskNumber)
{
case 1:
TaskOne.Do();
MainClass.Main(args);
break;
case 2:
TaskTwo.Do();
MainClass.Main(args);
break;
case 3:
TaskThree.Do();
MainClass.Main(args);
break;
case 4:
TaskFour.Do();
MainClass.Main(args);
break;
case 5:
TaskFive.Do();
MainClass.Main(args);
break;
case 6:
TaskSix.Do();
MainClass.Main(args);
break;
case 7:
TaskSeven.Do();
MainClass.Main(args);
break;
case 8:
TaskEight.Do();
MainClass.Main(args);
break;
case 9:
TaskNine.Do();
MainClass.Main(args);
break;
case 10:
TaskTen.Do();
MainClass.Main(args);
break;
case 11:
TaskEleven.Do();
MainClass.Main(args);
break;
case 12:
Proof.Do();
MainClass.Main(args);
break;
}
}
public static void Do()
{
int[] a = new int[3];
int[] b = new int[3];
int[] c = new int[3];
int[] d = new int[3];
for (int i = 0; i < 4; i++)
{
for (int j = 0; j < a.Length; j++)
{
switch (i)
{
case 0:
Console.Write("Please enter a" + (j + 1) + ": ");
while (true)
{
try
{
a[j] = int.Parse(Console.ReadLine());
break;
}
catch (FormatException)
{
Console.Write("Incorrect input, try again: ");
}
}
break;
case 1:
Console.Write("Please enter b" + (j + 1) + ": ");
while (true)
{
try
{
b[j] = int.Parse(Console.ReadLine());
break;
}
catch (FormatException)
{
Console.Write("Incorrect input, try again: ");
}
}
break;
case 2:
Console.Write("Please enter c" + (j + 1) + ": ");
while (true)
{
try
{
c[j] = int.Parse(Console.ReadLine());
break;
}
catch (FormatException)
{
Console.Write("Incorrect input, try again: ");
}
}
break;
case 3:
Console.Write("Please enter d" + (j + 1) + ": ");
while (true)
{
try
{
d[j] = int.Parse(Console.ReadLine());
break;
}
catch (FormatException)
{
Console.Write("Incorrect input, try again: ");
}
}
break;
}
}
}
//the hard part:
//let's start by finding the determinant
int delta = a[0] * ((b[1] * c[2]) - (c[1] * b[2])) - b[0] * ((a[1] * c[2]) - (a[2] * c[1])) + c[0] * ((a[1] * b[2]) - (b[1] * a[2]));
Console.WriteLine("delta: " + delta);
if (delta != 0)
{
//now we need to find the determinant for other matricies
int deltaX = d[0] * ((b[1] * c[2]) - (c[1] * b[2])) - b[0] * ((d[1] * c[2]) - (d[2] * c[1])) + c[0] * ((d[1] * b[2]) - (b[1] * d[2]));
int deltaY = a[0] * ((d[1] * c[2]) - (c[1] * d[2])) - d[0] * ((a[1] * c[2]) - (a[2] * c[1])) + c[0] * ((a[1] * d[2]) - (d[1] * a[2]));
int deltaZ = a[0] * ((b[1] * d[2]) - (d[1] * b[2])) - b[0] * ((a[1] * d[2]) - (a[2] * d[1])) + d[0] * ((a[1] * b[2]) - (b[1] * a[2]));
//now we find the thingies(whatever they're called i dont f*****g remember and cant be bothered googling) using the cramer formula
int x = deltaX / delta;
int y = deltaY / delta;
int z = deltaZ / delta;
Console.WriteLine("x = " + x);
Console.WriteLine("y = " + y);
Console.WriteLine("z = " + z);
}
else
{
Console.WriteLine("Hell no! You can't divide by zero, try again.");
}
TaskNine.Do();
}