/// <summary>
/// 六年级
/// </summary>
/// <returns></returns>
internal static string SixGrade()
{
string ret = RandomDigit(0, 3);
for (int i = 0; i < random.Next(2, 4); i++)
{
ret += RandomSymbols.Operators(1, 5) + RandomDigit(0, 3);
}
return(ret);
}
/// <summary>
/// 四年级
/// </summary>
/// <returns></returns>
internal static string FourGrade()
{
string equation = RandomSymbols.Integer(1, 1000);
for (int i = 0; i < 3; i++)
{
equation += RandomSymbols.Operators(1, 5) + RandomSymbols.Integer(1, 1000);
}
return(equation);
}
/// <summary>
/// 五年级
/// </summary>
/// <returns></returns>
internal static string FiveGrade()
{
if (random.Next(1, 3) == 1)
{
return(RandomSymbols.Decimals(1, 100, 1, 100) + RandomSymbols.Operators(1, 5) + RandomSymbols.Integer(1, 100));
}
if (random.Next(1, 3) == 2)
{
return(RandomSymbols.Integer(1, 100) + RandomSymbols.Operators(1, 5) + RandomSymbols.Decimals(1, 100, 1, 100));
}
return(RandomSymbols.Decimals(1, 100, 1, 100) + RandomSymbols.Operators(1, 5) + RandomSymbols.Decimals(1, 100, 1, 100));
}
/// <summary>
/// 三年级
/// </summary>
/// <returns></returns>
internal static string ThreeGrade()
{
return(RandomSymbols.Integer(10, 100) + RandomSymbols.Operators(3, 5) + RandomSymbols.Integer(10, 100));
}
/// <summary>
/// 二年级
/// </summary>
/// <returns></returns>
internal static string SecondGrade()
{
return(RandomSymbols.Integer(10, 100) + RandomSymbols.Operators(1, 3) + RandomSymbols.Integer(10, 100));
}
/// <summary>
/// 一年级
/// </summary>
internal static string FirstGrade()
{
return(RandomSymbols.Integer(0, 20) + RandomSymbols.Operators(1, 3) + RandomSymbols.Integer(0, 20));
}