public static OrdinaryFractions2 GenerateSubtraction()
{
OrdinaryFractions2 ret;
do
{
ret.a.counter = UniversalFunctions.Rand(3, 10);
ret.a.denominator = UniversalFunctions.Rand(2, 10);
ret.b.counter = UniversalFunctions.Rand(1, 9);
ret.b.denominator = UniversalFunctions.Rand(1, 9);
ret._operator = "-";
ret.correctanswer.denominator = UniversalFunctions.LCM(ret.a.denominator, ret.b.denominator);
int tmpCounterA = ret.a.counter * (ret.correctanswer.denominator / ret.a.denominator);
int tmpCounterB = ret.b.counter * (ret.correctanswer.denominator / ret.b.denominator);
ret.correctanswer.counter = tmpCounterA - tmpCounterB;
if (ret.correctanswer.counter < 0)
{
continue;
}
int tmpGCD = UniversalFunctions.GCD(ret.correctanswer.counter, ret.correctanswer.denominator);
ret.correctanswer.counter /= tmpGCD;
ret.correctanswer.denominator /= tmpGCD;
} while (ret.correctanswer.counter < 0);
return(ret);
}
/// <summary>
/// Generate Subtraction Expression (Floating Points value)
/// </summary>
/// <returns></returns>
public static ValueDecimal2 GenerateSubtraction()
{
ValueDecimal2 ret;
ret.a = UniversalFunctions.RandDecimal(1, 9.5m);
ret.b = UniversalFunctions.RandDecimal(1, ret.a);
ret.correctanswer = ret.a - ret.b;
ret.displayvalue = Convert.ToString(ret.a) + " - " + Convert.ToString(ret.b) + " =";
return(ret);
}
/// <summary>
/// Generate Addition Expression (Floating Points value)
/// </summary>
/// <returns></returns>
public static ValueDecimal2 GenerateAddition()
{
ValueDecimal2 ret;
ret.a = UniversalFunctions.RandDecimal(0.1m, 9.5m);
ret.b = UniversalFunctions.RandDecimal(0.1m, 9.5m);
ret.correctanswer = ret.a + ret.b;
ret.displayvalue = Convert.ToString(ret.a) + " + " + Convert.ToString(ret.b) + " =";
return(ret);
}
/// <summary>
/// Generate Multiplication Expression (Floating Points value)
/// </summary>
/// <returns></returns>
public static ValueDecimal2 GenerateMultiplication()
{
ValueDecimal2 ret;
ret.a = UniversalFunctions.RandDecimal(1, 10, 10);
ret.b = UniversalFunctions.RandDecimal(1, 10, 10);
ret.correctanswer = ret.a * ret.b;
ret.displayvalue = Convert.ToString(ret.a) + " * " + Convert.ToString(ret.b) + " =";
return(ret);
}
/// <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);
}
public static OrdinaryFractions2 GenerateDivision()
{
OrdinaryFractions2 ret;
ret.a.counter = UniversalFunctions.Rand(1, 8);
ret.a.denominator = UniversalFunctions.Rand(1, 9);
ret.b.counter = UniversalFunctions.Rand(1, 8);
ret.b.denominator = UniversalFunctions.Rand(1, 9);
ret._operator = "\u00f7";
ret.correctanswer.counter = ret.a.counter * ret.b.denominator;
ret.correctanswer.denominator = ret.a.denominator * ret.b.counter;
int tmpGCD = UniversalFunctions.GCD(ret.correctanswer.counter, ret.correctanswer.denominator);
ret.correctanswer.counter /= tmpGCD;
ret.correctanswer.denominator /= tmpGCD;
return(ret);
}
/// <summary>
/// Return an expression of two Ordinary Fractions
/// </summary>
/// <returns></returns>
public static OrdinaryFractions2 GenerateAddition()
{
OrdinaryFractions2 ret;
ret.a.counter = UniversalFunctions.Rand(1, 8);
ret.a.denominator = UniversalFunctions.Rand(1, 9);
ret.b.counter = UniversalFunctions.Rand(1, 8);
ret.b.denominator = UniversalFunctions.Rand(1, 9);
ret._operator = "+";
ret.correctanswer.denominator = UniversalFunctions.LCM(ret.a.denominator, ret.b.denominator);
int tmpCounterA = ret.a.counter * (ret.correctanswer.denominator / ret.a.denominator);
int tmpCounterB = ret.b.counter * (ret.correctanswer.denominator / ret.b.denominator);
ret.correctanswer.counter = tmpCounterA + tmpCounterB;
int tmpGCD = UniversalFunctions.GCD(ret.correctanswer.counter, ret.correctanswer.denominator);
ret.correctanswer.counter /= tmpGCD;
ret.correctanswer.denominator /= tmpGCD;
return(ret);
}
/// <summary>
/// Generate Expression
/// for example: 15% z 6 =
/// </summary>
/// <returns></returns>
public static Percents2 GenerateExpression1()
{
Percents2 exp;
exp.Value = UniversalFunctions.Rand(5, 100);
int count = 0;
do
{
count++;
if (count > 150)
{
count = 0;
exp.Value = UniversalFunctions.Rand(5, 100);
}
exp.Percent = UniversalFunctions.RandDecimal(0.01m, 1.0m, 100);
} while ((exp.Value * exp.Percent) != (int)(exp.Value * exp.Percent));
exp.correctvalue = exp.Value * exp.Percent;
exp.displayvalue = Convert.ToString((int)(exp.Percent * 100)) + "% z " + Convert.ToString(exp.Value) + " =";
return(exp);
}
/// <summary>
/// Return expression of Floating Points
/// </summary>
/// <returns></returns>
public static ValueDecimal2 GetValue()
{
return(data[UniversalFunctions.Rand(1, count)]);
}