Delphi代碼如下:
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procedure?TForm1.Button1Click(Sender:?TObject);
var
購物總價(jià):Integer;
折扣:Extended;
begin
購物總價(jià):=StrToInt(Edit1.Text);
if?購物總價(jià)250?then
begin
折扣:=0;
end
else?if?購物總價(jià)500?then
begin
折扣:=0.05;
end
else?if?購物總價(jià)1000?then
begin
折扣:=0.075;
end
else?if?購物總價(jià)2000?then
begin
折扣:=0.1;
end
{
此段的折扣是多少?
else?if?購物總價(jià)3000?then
begin
折扣:=0.05;
end
}
else?if?購物總價(jià)=3000?then
begin
折扣:=0.15;
end;
ShowMessage('您享受的折扣是:'+FloatToStr(折扣)
+'?原價(jià):'+IntToStr(購物總價(jià))
+'?折后總價(jià):'+FloatToStr(購物總價(jià)*(1-折扣)));
end;
很簡單,在end select前再多加一種情況case else return "XXXx",因?yàn)槟阒惶峁┝?-9這10種情況
Public Function Zuhe(ByVal qa As String) As String
Select Case qa
Case "0"
Return "1"
Case "1"
Return "3"
Case "2"
Return "4"
Case "3"
Return "6"
Case "4"
Return "2"
Case "5"
Return "8"
Case "6"
Return "9"
Case "7"
Return "7"
Case "8"
Return "5"
Case "9"
Return "0"
Case else
Return "XXXX"
End Select
End Function
首先新建一個(gè)類庫項(xiàng)目,把你的代碼以類(需要實(shí)例)或模塊(靜態(tài))的形式封裝好,生成過后在輸出目錄(bin/debug或bin/release)里面會(huì)有個(gè)項(xiàng)目名.dll文件,就是它了。
在調(diào)用方項(xiàng)目里,右鍵解決方案資源管理器中的引用,添加引用,瀏覽到你的dll文件。接著到你的代碼中,代碼最上面寫:
Imports 項(xiàng)目名
然后調(diào)用這個(gè)類或模塊即可。
根據(jù)你的情況,可能用模塊封裝更適合一些。比如:
Public Module MatrixSolve
Public Function Solve(para1 As Double,para2 As Double) As Double
'一些代碼
Return result
End Function
End Module
調(diào)用起來只要這樣即可:
Dim num As Double = MatrixSolve.Solve(x,y)
注意模塊和函數(shù)的訪問級別都用Public,否則外面無法訪問。
有幾個(gè)地方要注意:
1、VB中的三角函數(shù)的角度全部是用弧度制表示的,如果是度數(shù)的話,應(yīng)先乘以180再除以π轉(zhuǎn)成弧度,再用函數(shù)計(jì)算結(jié)果。
2、VB中直接支持的三角函數(shù)有:Sin()、Cos()、Tan(),如果涉及到其它三角函數(shù),可以從下面列出的代碼中自己選擇相應(yīng)的函數(shù):
Function
Sec(X)
As
Double
'正割
Sec
=
1
/
Cos(Angle)
End
Function
Function
Csc(X)
As
Double
'余割
Csc
=
1
/
Sin(Angle)
End
Function
Function
Cot(X)
As
Double
'余切
Cot
=
1
/
Tan(Angle)
End
Function
Function
ArcSin(X)
As
Double
'反正弦
ArcSin
=
Atn(X
/
Sqr(-X
*
X
+
1))
End
Function
Function
ArcCos(X)
As
Double
'反余弦
ArcCos
=
Atn(-X
/
Sqr(-X
*
X
+
1))
+
2
*
Atn(1)
End
Function
Function
ArcSec(X)
As
Double
'反正割
ArcSec
=
Atn(X
/
Sqr(X
*
X
-
1))
+
Sgn((X)
-
1)
*
(2
*
Atn(1))
End
Function
Function
ArcCsc(X)
As
Double
'反余割
ArcCsc
=
Atn(X
/
Sqr(X
*
X
-
1))
+
(Sgn(X)
-
1)
*
(2
*
Atn(1))
End
Function
Function
ArcCot(X)
As
Double
'反余切
ArcCot
=
Atn(X)
+
2
*
Atn(1)
End
Function
Function
HSin(X)
As
Double
'雙曲正弦
HSin
=
(Exp(X)
-
Exp(-X))
/
2
End
Function
Function
HCos(X)
As
Double
'雙曲余弦
HCos
=
(Exp(X)
+
Exp(-X))
/
2
End
Function
Function
HTan(X)
As
Double
'雙曲正切
HTan
=
(Exp(X)
-
Exp(-X))
/
(Exp(X)
+
Exp(-X))
End
Function
Function
HSec(X)
As
Double
'雙曲正割
HSec
=
2
/
(Exp(X)
+
Exp(-X))
End
Function
Function
HCsc(X)
As
Double
'雙曲余割
HCsc
=
2
/
(Exp(X)
-
Exp(-X))
End
Function
Function
HCot(X)
As
Double
'雙曲余切
HCot
=
(Exp(X)
+
Exp(-X))
/
(Exp(X)
-
Exp(-X))
End
Function
Function
HArcsin(X)
As
Double
'反雙曲正弦
HArcsin
=
Log(X
+
Sqr(X
*
X
+
1))
End
Function
Function
HArccos(X)
As
Double
'反雙曲余弦
HArccos
=
Log(X
+
Sqr(X
*
X
-
1))
End
Function
Function
HArctan(X)
As
Double
'反雙曲正切
HArctan
=
Log((1
+
X)
/
(1
-
X))
/
2
End
Function
Function
HArcsec(X)
As
Double
'反雙曲正割
HArcsec
=
Log((Sqr(-X
*
X
+
1)
+
1)
/
X)
End
Function
Function
HArccsc(X)
As
Double
'反雙曲余割
HArccsc
=
Log((Sgn(X)
*
Sqr(X
*
X
+
1)
+
1)
/
X)
End
Function
Function
HArccot(X)
As
Double
'反雙曲余切
HArccot
=
Log((X
+
1)
/
(X
-
1))
/
2
End
Function
首先在窗體上添加Button1,ListBox1,下面是完整代碼
Public?Class?Form1
Public?Sub?BubbleSort(ByVal?arr()?As?Integer)?'冒泡法排序
Dim?temp?As?Double
Dim?i,?j?As?Integer
For?i?=?0?To?arr.GetUpperBound(0)?-?1
For?j?=?i?+?1?To?arr.GetUpperBound(0)?-?1
If?arr(i)??arr(j)?Then
temp?=?arr(j)
arr(j)?=?arr(i)
arr(i)?=?temp
End?If
Next
Next
End?Sub
Private?Sub?Button1_Click(ByVal?sender?As?System.Object,?ByVal?e?As?System.EventArgs)?Handles?Button1.Click?'調(diào)用
Dim?arr()?As?Integer?=?{55,?22,?33,?11,?77,?88}
BubbleSort(arr)?'調(diào)用排序過程
Me.ListBox1.Items.Clear()
For?i?=?0?To?arr.GetUpperBound(0)?-?1?'顯示排序后結(jié)果
Me.ListBox1.Items.Add(arr(i).ToString)
Next
End?Sub
End?Class
本文標(biāo)題:vb.net函數(shù)定義代碼,VB定義函數(shù)
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