Page 51 - Computing Book 8

Developing Applications – Visual Studio Class 8

If…Then…ElseIf Statement

If there are more than two choices to display, using the If...Then...Else statement is not enough. To
provide more choices, we can use the If...Then...ElseIf statement. In the following example, we have
created a program that translates a student’s score to the corresponding grade.
Follow the steps below to create the program using If…Then…Elself statement:
1. Create a new form with three labels, one text box and a button.
2. Edit the text for the first label to “Enter Your Score”.
3. Edit the button text to Show Grade.
4. Edit the text of the second label to “Your Grade:”
5. Place the third label adjacent to the second label and we will use
this label to generate the grade in it, edit the label text to “Grade
not generated yet” and also change the name of this label to “lblGrade” from the properties
panel.
6. Enter the code as shown in the example:

Declaration of Score Variable
Declaration of Grade Variable
Declaration of score value which would
be the TextBox1 which is user input

If…Then…Else Statement which
will take decision about the grade.
Data will be taken from the text
box and evaluated by the program
at every line and when the criteria This is the 3 label which will display the
rd
matches it will set the value of value of grade variable after taking
grade to the relevant string value
decision from if…then...else statement
• The first condition score >= 90 is evaluated and if it is true, then the variable grade takes the
value A.
• If a condition is found true, the following conditions are not evaluated and the instructions
under End If are executed.

• If a condition is evaluated as false, then the next condition is evaluated and so on, until a
condition is true.
• If none of the conditions are found to be true, then the code under Else is executed which
has a string value of “Need Improvement”.
Conditional and Logical Operators

Conditional and Logical operators can be used in making decision-based programs:
Conditional Operators Logical Operators
Operator Meaning Operator Meaning
= Equal to And Both sides must be true
> More than Or One side or other must be true
< Less Than XOr One side or other must be true but not both
>= More than or equal to Not Negates truth
<= Less than or equal to
<> Not Equal to

The City School /Academics/Computing Curriculum/Class 8/2020-2021 Page 50 of 75