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 Boolean Expressions in C#

Boolean Expressions in C#

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Module 07: Boolean Expressions in C#

A Boolean expression is one that can be evaluated as true or false.
A Boolean expression can use relational operators such as < for less than, > for greater than, == for equal, != for not equat and the logical operators && (and) and || (or).
In this lesson we will use the If and optional else statements to decide which statements to execute.

Goals:

• Be able to use Boolean Expressions using if/else Control Structures; Values in Controls: text box, check box, radio buttons; Conditional operator:?; and switch/case

Objectives:

• Evaluate Boolean expressions;
• Use if else control structure in calculations;
• Retrieve numeric values from text box;
• Use check boxes and radio buttons in an application;
• Recognize and be able to use the conditional operator;
• Write compound Boolean expressions;
• Be able to write code using the switch/case construct.

Please study the material at each of the links below.

1. Microsoft Reference: Boolean expressions: C# if/else, conditional operators, OR ||, AND &&, switch/case
2. Boolean Expressions: A Boolean expression is one that can be evaluated to true or false
3. if Statements: An if statement executes a group of statements only if certain conditions are true
4. Getting Numbers from Text Box: Numeric values in a text box must be parsed.
5. A buffet restaurant part 1: Adding radio buttons: A restaurant charges different prices for breakfast, lunch and dinner, dicounts.
6. A buffet restaurant part 2: Adding code for radio buttons and check boxes: Radio buttons and check boxes have a Boolean property checked
7. Rats in a maze: A few problems to solve using && and ||
8. Left or Right?: On mouse move determine if the mouse is on left or right of form
9. Top or bottom?: On mouse move determine if the mouse is on top or bottom of form
10. Adding the Mouse Move Event: Shows the X and Y positions when the mouse moves on the form
11. Scrolling: Scrolls a label across the form on the Timer event
12. Letter Grade: Nested if/else to find letter grade
13. BMI: Body Mass Index: Nested if/else to find BMI Risk
14. The conditional operator: ?: The ? can be used for very simple Boolean expressions in place of if/else code
15. AND && And OR ||: && means AND, || means OR
16. Drill on Boolean: Drill to test your understanding
17. Middle or Side: Determine if mouse is on the side or middle
18. Boolean Variables and Properties: Boolean values do not need to be compared to anything
19. switch/case: switch/case to show season

Glossary for boolean lesson
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