Visual basic control flow structure and uses of each

Visual basic control flow structure and uses of each

Hello Marie!

1. Sequence – executes lines of code in the order in which they are written

2. Selection – enables you to selectively execute one part of the program instead of another.

2.a. If/Then Statement

2.b. If/Then Else Statement

2.c. Nested If

2.d. Select Case

3. Repetitions – provide a means to repeat certain parts of a program.

3.a. Do While Loop

3.b. Do Until Loop

3.c. Do Loop Until

3.d. For Loop

4. The operators that we can use in VB or any programming language are Addition, Subtraction, Division(float “/”)-use to return fractional or decimal places, Division(integer “”)-use to return whole values only, Exponentiation (caret “^”)-raise a value to a power, and Modulus division (Mod)- this is used to divide numbers and return only the remainder.

Example: Let’s say we have form, command button and textbox. We will test the value of the textbox if it is “0” or “1”

Place all the objects we need for this. Click commandbutton1 and change its name to cmdTest. Double click cmdTest.

Line 1: Private sub cmdTest_Click()

Line 2: If text1=”0” then

Line 3: MsgBox “You entered 0 (zero)”

Line 4: End if

Line 5: End Sub

Ignore lines 1 and 5. Focus on lines 2-4. Line 2 will determine if you entered “0” – it will display the message in line 3. If you did not place anything (no value entered) or any characters or number it will not display anything only if you enter the proper number that will satisfy the statement.