static void Test()
{
Console.WriteLine("Enter a?b ?(+-*/) ");
string expression = Console.ReadLine(); ///20+30
char sign = ' ';
try
{
if (expression.Contains('+'))
{
sign = '+';
}
if (expression.Contains('-'))
{
sign = '-';
}
if (expression.Contains('*'))
{
sign = '*';
}
if (expression.Contains('/'))
{
sign = '/';
}
string[] numbers = expression.Split(sign);
double a = double.Parse(numbers[0]);
double b = double.Parse(numbers[1]);
Matem matem = new Matem();
FuncDelegate func = null;
double res = 0;
switch (sign)
{
case '+': func = matem.Sum; break;
case '-': func = new FuncDelegate(matem.Sub); break;
case '*': func = Matem.Mult; break;
case '/': func = Matem.Div; break;
default:
throw new Exception("no sign");
}
// Console.WriteLine($"{a}{sign}{b}={func?.Invoke(a,b)}");
Console.WriteLine($"{a}{sign}{b}={func(a, b)}");
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
}
static void Test2()
{
Matem matem = new Matem();
FuncDelegate func = matem.Sum;
func += matem.Sub;
func += Matem.Mult;
func += Matem.Div;
double a = 10, b = 20;
Console.WriteLine($"{a} {b}={func(a, b)}");
Console.WriteLine($"+--------------------------------------");
foreach (FuncDelegate f in func.GetInvocationList())
{
Console.WriteLine($"{a} {f.Method.Name} {b}={f(a, b)}");
}
}
