public static void Main(String[] args)
{
string inp = Console.ReadLine();
FixMultiplication obj = new FixMultiplication();
Console.WriteLine(" " + obj.FindDigit(inp));
}
public void Digit_MissingIn_FirstOperand()
{
// Arrange
string equation = "4?*47=1974";
int expected = 2;
// Act
int actual = FixMultiplication.FindDigit(equation);
// Assert
Assert.AreEqual(expected, actual);
}
public void When_NumberHas_LeadingZero()
{
// Arrange
string equation = "42*?47=1974";
int expected = -1;
// Act
int actual = FixMultiplication.FindDigit(equation);
// Assert
Assert.AreEqual(expected, actual);
}
public void When_NoSolution()
{
// Arrange
string equation = "2*12?=247";
int expected = -1;
// Act
int actual = FixMultiplication.FindDigit(equation);
// Assert
Assert.AreEqual(expected, actual);
}
public void Digit_MissingIn_Product()
{
// Arrange
string equation = "42*47=1?74";
int expected = 9;
// Act
int actual = FixMultiplication.FindDigit(equation);
// Assert
Assert.AreEqual(expected, actual);
}
