7/31/2019 Chapter 4 Homework Solutions

1/4

Chapter 4 Homework Solutions:

Chapter 4-Decisions and Conditions

ANSWERS TO REVIEW QUESTIONS

1. What is the general format of the statement used to code decisions in an application?If (condition) Then

statement(s)

[ElseIf (condition) Then

statement(s)]

[Else

statement(s)]

End If

2. What is a condition?

The test in an If statement is based on a condition. To form conditions, six relational

operators, >, =, and , =, and

7/31/2019 Chapter 4 Homework Solutions

2/4

variables and constants, object properties, and arithmetic expressions. However, it is

important to note that comparisons must be made on like types; that is, strings can be

compared only to other strings, and numeric values can be compared only to other numeric

values, whether a variable, constant, property, or arithmetic expression.

8. Explain a Boolean variable test for True or False. Give an example.

Visual Basic evaluates the condition in an If statement. If the condition is a Booleanvariable name, it holds the values True or False.

For example:

If blnSuccessfulOperation = True Then

is equivalent to

If blnSuccessfulOperation ThenBoolean variables hold the value zero when False, and negative one when True.

9. Give an example of a situation where nested Ifs would be appropriate.

An example where nested Ifs would be appropriate would be a situation where multiple

conditions must be tested and input validation required. The following code would be

extremely awkward if block ifs were used instead.

intHours = Val(txtHours.Text)

intPayRate = Val(txtPayRate.Text)

If intHours > 0 And intHours 0 Then

cPay = intHours * intPayRate

Else

MsgBox Please Input the Rate of Pay

End If

Else

MsgBox Please enter the number of non-overtime hours worked this week.EndIf

10. When would a message box be used?

A message box would be used whenever a message must be displayed to the user.

Validating input data is an appropriate time to use a message box. If we reject bad data, we

need to let the user know why the desired action was not achieved.

7/31/2019 Chapter 4 Homework Solutions

3/4

7/31/2019 Chapter 4 Homework Solutions

4/4