Chapter 51 Decisions Relational and Logical Operators If Blocks Select Case Blocks.

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Presentation transcript:

Chapter 51 Decisions Relational and Logical Operators If Blocks Select Case Blocks

Chapter 52 Relational and Logical Operators Relational Operators ANSI Values Logical Operators Boolean Data Type

Chapter 53 Relational Operators <less than <=less than or equal to >greater than >=greater than or equal to =equal to <>not equal to ANSI values are used to decide order for strings.

Chapter 54 ANSI Character Set A numeric representation for every key on the keyboard and for other assorted characters.

Chapter 55 ANSI Character Set: continued A numeric representation for every key on the keyboard and for other assorted characters.

Chapter 56 Chr Function For n between 0 and 255, Chr(n) is the string consisting of the character with ANSI value n. EXAMPLES: Chr(65) is "A" Chr(162) is "¢"

Chapter 57 Asc Function For a string str, Asc(str) is ANSI value of the first character of str. EXAMPLES: Asc("A") is 65 Asc("¢25") is 162

Chapter 58 Boolean Data Type An expression or variable that evaluates to either True or False is said to have Boolean data type. Example: The statement txtBox.Text = (2+3)<6 displays True in the text box.

Chapter 59 Example When a = 3, b = 4 (a + b) < 2 * a = 7 2 * 3 = 6 7 is NOT less than 6 and the value of the expression is False

Chapter 510 Another Example a = 4 b = 3 c = 5 ( c – b ) = ( a / 2 ) 5 – 3 = 2 4 / 2 = 2 True because 2 equals 2

Chapter 511 Relational Operator Notes Relational operators require an operand on both sides of the operator Value of a relational expression will always be True or False Expressions are evaluated from left to right with no order of operations