/// <summary>
/// Generate Subtraction Expression
/// </summary>
/// <returns></returns>
public static ValueInt2 GenerateSubtraction()
{
var ret = new ValueInt2();
ret.a = UniversalFunctions.Rand(1, 100);
ret.b = UniversalFunctions.Rand(1, ret.a);
ret.correctanswer = ret.a - ret.b;
ret.displayvalue = Convert.ToString(ret.a) + " - " + Convert.ToString(ret.b) + " =";
return(ret);
}
/// <summary>
/// Verify correctness of Division (only integer value)
/// </summary>
/// <param name="value">value from user</param>
/// <param name="exp">original value</param>
/// <returns></returns>
public static bool VerifyDivision(string value, ValueInt2 exp)
{
int tmp;
try
{
tmp = exp.a / exp.b;
}
catch (Exception e)
{
return(false);
}
return(value == Convert.ToString(tmp));
}
/// <summary>
/// Verify correctness of Subtraction
/// </summary>
/// <param name="value">value from user</param>
/// <param name="exp">original value</param>
/// <returns></returns>
public static bool VerifySubtraction(string value, ValueInt2 exp)
{
return(exp.a - exp.b == Convert.ToInt32(value));
}
/// <summary>
/// Verify correctness of Multiplication
/// </summary>
/// <param name="value">value from user</param>
/// <param name="exp">original value</param>
/// <returns></returns>
public static bool VerifyMultiplication(string value, ValueInt2 exp)
{
return(exp.a * exp.b == Convert.ToInt32(value));
}
/// <summary>
/// Verify correctness of Addition
/// </summary>
/// <param name="value">value from user</param>
/// <param name="exp">original value</param>
/// <returns></returns>
public static bool VerifyAddition(string value, ValueInt2 exp)
{
return(exp.a + exp.b == Convert.ToInt32(value));
}