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: C#, ListBox. .

, . :

 

[] [] ([])

{

;

}

 

. .

, , :

:

o private

o protected

o public ,

, : , C#, void, .

, . , : , , .

, . . .

, , , , . . - , return . , return , .

, :

 

public double Calc(double a, double b, double c)

{

if (a > b)

return Math.Sin(a) * Math.Cos(b);

else

{

double k = Math.Tan(a * b);

return k * Math.Exp(c / k);

}

}

 

C# , . . , : , :

 

/// <summary>

/// X Y

/// </summary>

private int Pow(int X, int Y)

{

int b = 1;

while (Y!= 0)

if (Y % 2 == 0)

{

Y /= 2;

X *= X;

}

else

{

Y--;

b *= X;

}

return b;

}

 

/// <summary>

/// X Y

/// </summary>

private double Pow(double X, double Y)

{

if (X!= 0)

return Math.Exp(Y * Math.Log(Math.Abs(X)));

else if (Y == 0)

return 1;

else

return 0;

}

 

, Pow , :

Pow(3, 17);

Pow(3.0, 17.0);

 

C# 4.0 (Visual Studio 2010) , . :

 

private void GetData(int Number, int Optional = 5)

{

Console.WriteLine("Number: {0}", Number);

Console.WriteLine("Optional: {0}", Optional);

}

 

:

GetData(10, 20);

GetData(10);

 

Optional 20, , 5, .. .

, , :

 

private void GetData(int Optional = 5, int Number)

 

( ref out), . , :

 

private void Calc(int Number)

{

Number = 10;

}

 

, Number, . :

 

int n = 1;

Calc(n);

Console.WriteLine(n);

 

1, , Calc, . , , . . .

, ref , :

 

private void Calc(ref int Number)

{

Number = 10;

}

int n = 1;

Calc(ref n);

Console.WriteLine(n);

 

10: . , .. , .

, , out. , :

 

private void Calc(out int Number)

{

Number = 10;

}

int n; // !

Calc(out n);

 

string

C# string. , (, , ) , :

 

string a = "";

string b = "";

 

:

 

string c = a + " " + b; // :

 

string String, . , IndexOf , Substring , :

 

string a = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";

int index = a.IndexOf("OP"); // : 14 ( 0)

string b = a.Substring(3, 5); // : DEFGH

 

, escape-, :

 

Escape-
\"
\\
\n
\r
\t

 

ListBox

ListBox , . Items. Items , . Add, RemoveAt Insert , .

Items , . ToString. . , Items , object, , string:

 

string a = (string)listBox1.Items[0];

 

SelectedIndex.





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