1) write a vb program to design a simple calculator to

1) Write a VB Program to design a simple calculator to perform addition,

subtraction, multiplication and division (Use functions for the calculations).

Dim x As Double, y As Double

Dim z As Boolean

Dim opr As String

Private Sub cmdadd_Click ()

x=Val(lblresult.Caption)

opr = "+"

lblresult.Caption = " "

End Sub

Private Sub cmdclear_Click()

lblresult.Caption = ""

End Sub

Private Sub cmddiv_Click ()


opr = "/"


End Sub

Private Sub cmddot_Click ()

If z = True Then

lblresult.Caption=""

z=False

End If

If InStr(lblresult.Caption, ".") Then

Exit Sub

Else

lblresult.Caption = lblresult.Caption + "."

End If

End Sub

Private Sub cmdequals_Click()

Dim result As Double

y = Val(lblresult.Caption)

If opr ="+" Then

result=add(x, y)

End If

If opr = "-" Then

result = subtract(x, y)

EndIf

If opr="*" Then

result=mul(x, y)

EndIf

If opr="/" Then

result=div(x, y)

End If

lblresult.Caption=result

End Sub

Private Sub cmdmul_Click()


opr = "*"


End Sub

Private Sub cmdsbtract_Click()


opr = "-"


End Sub

Private Sub Label1_Click()

End

End Sub

Private Sub Number_Click(Index As Integer)

If z Then

lblresult.Caption = ""

z = False

End If

lblresult.Caption = lblresult.Caption +Number(Index).Caption

End Sub

Function add(ByVal x As Double, ByVal y As Double) As Double

add = x +y

End Function

Function subtract(ByVal x As Double, ByVal y As Double) As Double

subtract = x - y

End Function

Function mul(ByVal x As Double, ByVal y As Double) As Double

mul = x * y

End Function

Function div(ByVal x As Double, ByVal y As Double) As Double

div = x / y

End Function

2) Design a User Interface (UI) to accept the student details such as name,

department and total marks. Validate the input data and calculate the

percentage and division.

Private Sub Command1_Click()

Dim avg As Single

If Len(Text3.Text) = 0 Or Len(Text4.Text) = 0 Or Len(Text5.Text) = 0 Or Len(Text6.Text) = 0 Or

Len(Text7.Text) = 0 Then

MsgBox (" Field Should not be Empty ")

Exit Sub

End If

Label10.Caption=Val(Text3.Text)+Val(Text4.Text)+Val(Text5.Text)+Val(Text6.Text) +

Val(Text7.Text)

Label12.Caption = Val(Label10.Caption) / 5

avg = Val(Label12.Caption)

If (avg >= 75) Then

Label14.Caption = "Distinction"

ElseIf (avg >= 60) Then

Label14.Caption = "First Class"


Label14.Caption = "Second Class"


Label14.Caption = "Third Class"

Else

Label14.Caption = "fail"

End If

If Val(Text3.Text) < 35 Or Val(Text4.Text) < 35 Or Val(Text5.Text) < 35 Or Val(Text6.Text) < 35

Or Val(Text7.Text) < 35 Then Label14 = "fail"

End If

End Sub


Text1.Text = " "

Text2.Text = " "

Text3.Text = " "

Text4.Text = " "

Text5.Text = " "

Text6.Text = " "

Text7.Text = " "

Label10.Caption = " "



End Sub

Private SubCommand3_Click()

End

End Sub

Private Sub Text1_KeyPress(KeyAscii As Integer)

If ((KeyAscii>= 65 And KeyAscii<= 91) Or (KeyAscii>= 97 And KeyAscii<= 123)

Or KeyAscii = 32 Or KeyAscii = 8) Then

Else

KeyAscii = 0

MsgBox("Enter only Alphabets")

End If

End Sub


If (KeyAscii>= 48 And KeyAscii<= 57)

Then

Else

KeyAscii = 0

MsgBox ("Enter onlyDigits")

End If

End Sub


If (KeyAscii>= 48 And KeyAscii<= 57) Then

Else

KeyAscii = 0

MsgBox ("Enter only Digits")

End If

End Sub



Else

KeyAscii = 0

MsgBox ("Enter onlyDigits")

End If

End Sub



Else

KeyAscii = 0

MsgBox ("Enter only Digits")

End If

End Sub

Private Sub Text7_KeyPress(KeyAscii As Integer) If (KeyAscii>= 48 And KeyAscii<= 57) Then Else KeyAscii = 0 MsgBox ("Enter only Digits") End If End Sub

3) Design a VB application which has MDI and Child forms. Create a menu

having the items such as file (New, Open), Format (Font, Regular,

Bold,Italic) and Exit in the MDI form. Also create a text box and use a

Common Dialog Box control for changing the font, fore color and back color

of the text box.

Private Sub mnubackcolor_Click()

CommonDialog1.ShowColor

Text1.BackColor = CommonDialog1.Color

End Sub

Private Sub mnubold_Click()

CommonDialog1.ShowFont

Text1.Font = CommonDialog1.FontBold

End sub

Private Sub mnuchild_Click()

child1.Show

End Sub

Private Sub mnuchild2_Click()

child2.Show

End Sub

Private Sub mnuexit_Click()

End

End Sub

Private Sub mnufont_Click()


Text1.Font = CommonDialog1.FontName

EndSub

Private Sub mnuforecolor_Click()

CommonDialog1.ShowColor

Text1.ForeColor = CommonDialog1.Color

EndSub

Private Sub mnuitalic_Click()


Text1.Font = CommonDialog1.FontItalic

End Sub

Private Sub mnursize_Click()


Text1.Font = CommonDialog1.FontSize

End Sub

4) VB program to Encrypt and Decrypt a string. (Use Rnd() to generate the

Encryption and Decryption keys).

Dim dpt As String

Dim key As Integer

Dim rnum As Integer

Dim ept As String


Text1.Text = ept

End Sub


Dim i As Integer

Dim str2 As Stringdpt = ""

For i = 1 To Len(ept)

str2 = Mid(ept, i, 1)

str2 = Chr(Asc(str2) - rnum)

dpt = dpt + str2

Next i

Text1.Text = dpt

End Sub


End

EndSub

Private Sub Form_Load()

ept =""

dpt = ""

Text1.Text = ""

rnum = (10 * Rnd + 1)

End Sub

Private Sub Text1_keypress(KeyAscii As Integer)

If (KeyAscii>= 65 And keyAcii<= 90) Or (KeyAscii>= 97 And KeyAscii<=

22) Or KeyAscii=32 Then

key = KeyAscii + rnum

ept = ept + Chr(key)

Else

KeyAscii = 0

End If

End Sub

5) Design a small Alarm Clock Application.


Label2.Caption = Text1.Text

End Sub


Timer1.Enabled = True

End Sub


Timer1.Enabled = False

End Sub


End

End Sub

Private Sub Form_Load()

Timer1.Enabled = False

Timer1.InterVal = 500

Text1.Text = "00:00:00"

End Sub

Private Sub Timer1_Timer()

Dim i As Integer

Label3.Caption = Format(Time, "hh:mm:ss")

If Trim(Label3.Caption) >= Trim(Label2.Caption) Then

Beep

End If

End Sub

6) Write a VB Program to Validate the username and password form the

database and display the appropriate message.(Use Data Control)


Dim x As Integer x = 0

Adodc1.Recordset.MoveFirst

Do While Not Adodc1.Recordset.EOF

If Text1.Text=Adodc1.Recordset.Fields(0) AndText2.Text=Adodc1.Recordset.Fields(1) Then

MsgBox ("Valid user name and password")

End If

Adodc1.Recordset.MoveNext

Loop

If x = 0 Then

MsgBox ("inValid username or password")

Text1.Text = ""

Text2.Text = ""

Text1.SetFocus

End If

End Sub


End

End Sub

7) Design a VB application to record the employee details such as EmpId,

EmpName, Designation and Basic Pay. Calculate the DA, HRA, Deduction

and Gross Salary. (Make the necessary assumptions )Use Select .. case for

decision making.


Adodc1.Recordset.AddNew

End Sub


Select Case cmddes

Case "manager"

txtda.Text = Val(txtbasic.Text) *10/100

txthra.Text=Val(txtbasic.Text)*15/100

txtded.Text = Val(txtbasic.Text) *12 / 100

txtgross.Text = Val(txtbasic.Text) + Val(txtda.Text) + Val(txthra.Text)

txtnet.Text = Val(txtgross.Text) - Val(txtded.Text)

Case "engineer"

txtda.Text = Val(txtbasic.Text) *10 /100

txthra.Text=Val(txtbasic.Text)*15 /100



txtnet.Text = Val(txtgross.Text) – Val(txtded.Text)

Case "clerk"

txtda.Text = Val(txtbasic.Text) *10 /100

txthra.Text=Val(txtbasic.Text)*15 /100



txtnet.Text = Val(txtgross.Text) – Val(txtded.Text)

EndSelect

EndSub


Adodc1.Recordset.Update

End Sub


End End Sub

Private Sub Form_Load() cmddes.AddItem "manager" cmddes.AddItem "engineer"

cmddes.AddItem"Clerk"

End Sub

8) VB program to calculate the simple interest and compound interest. Use

DLLs for the calculation.

Public s1 As New SRIKANTH.class1


Dim x As Integer

p = Val(Text1.Text)

t = Val(Text2.Text)

r = Val(Text3.Text)

x = s1.SI(p, t, r)

Label5.Caption = "Simple Interest"

Label6.Caption = x

End Sub


Dim x As Integer

p = Val(Text1.Text)

t = Val(Text2.Text)

r = Val(Text3.Text)

x = s1.CI(p, t, r)

Label5.Caption = "Compound Interest"

Label6.Caption = x

End Sub


End

End Sub

Class Module Code

Public Function CI (ByVal p As Double, ByVal t As Double, ByVal r As Double) As

Double

CI = (p * (1 + r / 100) ^ t) - p

End Function

Public Function SI (ByVal p As Double, ByVal t As Double, ByVal r As Double) As

Double

SI = (p * t * r) / 100

End Function

9) VC++ program to create a Dialog box and display the position of mouse

pointer within the dialog box.

10) VC++ program to create and load a simple menu in a Window.

Part-B

1. Program to find largest of three numbers. CONTROL PROPERTIES VALUE

Text1 name Text1

Text (blank)

Text2 name Text2

Text (blank)

Text3 name Text3

Text (blank)

Command1 name Cmdlarg

Caption Largest

number

Command2 name cmdend

Caption end

Private Sub cmdlarg_Click()

Dim a, b, c As Integer

a = Val(Text1.Text)

b = Val(Text2.Text)

c = Val(Text3.Text)

If ((a > b) And (a > c)) Then

MsgBox ("a Is largest")

ElseIf (b > c) Then

MsgBox ("b Is largest")

Else

MsgBox ("c Is largest")

End If

End Sub

Private Sub cmdend_Click()

End

End Sub

2.Program to find area and circumference of a circle.

CONTROL PROPERTIES VALUE

Text1 name Text1

Text (blank)

Text2 name Text2

Text (blank)

Command1 name Cmdarea

Caption Area and circumference of a

circle


caption end

Private Sub cmdarea_Click()

Const pi As Single = 3.142

Dim r, area, cir As Single

r = Val(Text1.Text)

area = pi * r * r

cir = 2 * pi * r

Text2.Text = area

Text3.Text = cir

End Sub


End

End Sub

3. Program to check whether a number is odd or even.


Text1 name Text1

Text (blank)

Text2 name Text2

Text (blank)

Command1 name cmdevenodd

Caption Even / odd


caption End

Private Sub cmdevenodd_Click()

Dim n As Integer

n = Val(Text1.Text)

If (n Mod 2) = 0 Then

Text2.Text = "Even number"

Else

Text2.Text = "Odd number"

End If

End Sub


End

End Sub

4. Program to find sum of natural numbers up to a given number.


Text1 name Text1

Text (blank)

Text2 name Text2

Text (blank)

Command1 name cmdnatsum

Caption Sum of natural numbers


caption end

Private Sub cmdnatsum_Click()

Dim n, i, sum As Integer

n = Val(Text1.Text)

Print "natural numbers are"

For i = 1 To n

sum = sum + i

print i

Next i

Text2.Text = sum

End Sub


End

End Sub

5. Program to find Factorial of a given number.


Text1 name Text1

Text (blank)

Text2 name Text2

Text (blank)

Command1 name cmdfact

Caption factorial


caption end

Private Sub cmdfact_Click()

Dim n, i, fact As Integer

n = Val(Text1.Text)

fact = 1

If (n < 0) Then

MsgBox ("No factorial for -ve numbers")

Else

For i = 1 To n

fact = fact * i

Next i

Text2.Text = fact

End If

End Sub


End

End Sub

6. Program to find sum of individual digits of a number.


Text1 name Text1

Text (blank)

Text2 name Text2

Text (blank)

Command1 name cmddigits

Caption Sum of individual digits


caption end

Private Sub cmddigits_Click()

Dim n, sum, digit As Integer

n = Val(Text1.Text)

sum = 0

Do While (n <> 0)

digit = n Mod 10

sum = sum + digit

n = n \ 10

Loop

Text2.Text = sum

End Sub


End

End Sub

7. Program to check whether a number is Palindrome or not.


Text1 name Text1

Text (blank)

Text2 name Text2

Text (blank)

Command1 name cmdpal

Caption Palindrome or not


caption end

Private Sub cmdpal_Click()

Dim digit, temp, n, rev As Integer

n = Val(Text1.Text)

temp = n

rev = 0

Do While (n <> 0)

digit = n Mod 10

rev = rev * 10 + digit

n = n \ 10

Loop

Text2.Text = rev

If (temp = rev) Then

MsgBox ("Number is a palindrome")

Else

MsgBox ("Number is not a palindrome")

End If

End Sub


End

End Sub

8. Program to check whether a number is prime or not.


Text1 name Text1

Text (blank)

Text2 name Text2

Text (blank)

Command1 name cmdprime

Caption Prime or not


caption end

Private Sub cmdprime_Click()

Dim i, n As Integer

n = Val(Text1.Text)

For i = 2 To n \ 2

If (n Mod i) = 0 Then

Text2.Text = "Not prime "

Exit Sub

End If

Next i

Text2.Text = "Prime"

End Sub


End

End Sub

9. Program to find sum of two matrices.


Text1 name Text1

Text (blank)

Text2 name Text2

Text (blank)

Command1 name cmdfirst

Caption Input first matrix

Command2 name cmdsecond

caption Input second matrix

Command3 name cmdsum

caption Sum of 2 matrices

Dim a(2, 2), b(2, 2), c(2, 2), i, j, m, n As Integer

Private Sub cmdfirst_Click()

m = Val(Text1.Text)

n = Val(Text2.Text)

Print "First matrix"

For i = 1 To m

For j = 1 To n

a(i, j) = Val(InputBox("Enter the array elements one by one"))

Print a(i, j);

Next j

Print

Next i

End Sub

Private Sub cmdsecond_Click()

Print "Second matrix"

For i = 1 To m

For j = 1 To n

b(i, j) = Val(InputBox("Enter the array elements one by one"))

Print b(i, j);

Next j

Print

Next i

End Sub

Private Sub cmdsum_Click()

Print "sum of 2 matrices"

For i = 1 To m

For j = 1 To n

c(i, j) = a(i, j) + b(i, j)

Print c(i, j);

Next j

Print

Next i

End Sub

10. Program to demonstrate the use of List box.


Text1 name Text1

Text (blank)

Text2 name Text2

Text (blank)

Command1 name cmdadd

Caption add

Command2 name cmdremove

caption remove

Command3 name cmdclear

caption clear

Command4 name Cmdclose

Caption close

List1 name List1

list India

Usa

Private Sub cmdadd_Click()

List1.AddItem (Text1.Text)

Text1.Text = ""

Text2.Text = List1.ListCount

End Sub

Private Sub cmdclear_Click()

List1.Clear


End Sub

Private Sub cmdclose_Click()

End

End Sub

Private Sub cmdremove_Click()

Dim ind As Integer

ind = List1.ListIndex

If ind >= 0 Then

List1.RemoveItem ind


Else

Msgbox(“No item”)

End If

End Sub

Private Sub optred_Click()

Text1.ForeColor = vbRed

End Sub

Private Sub optgreen_Click()

Text1.ForeColor = vbGreen

End Sub

Private Sub optblue_Click()

Text1.ForeColor = vbBlue

End Sub

1) write a vb program to design a simple calculator to

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