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Objective 7.03 Apply Built-in Math Class Functions. Computer Programming I. Image taken from: http://www.stsd.org/webpages/cyurconic/news.cfm?subpage=67815. Objects/Classes and Methods in Visual Basic . An object is a structure containing data and methods that manipulate the data. - PowerPoint PPT Presentation
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COMPUTER PROGRAMMING I
Objective 7.03 Apply Built-in Math Class
Functions
Image taken from: http://www.stsd.org/webpages/cyurconic/news.cfm?subpage=67815
Objects/Classes and Methods in Visual Basic
An object is a structure containing data and methods that manipulate the data.
Almost everything you do in Visual Basic is associated with objects. If you are new to object-oriented programming, the following terms and concepts will help you get started.
Classes and Objects
The words "class" and "object" are used so much in object-oriented programming that it is easy to get the terms mixed up. Generally speaking, a class is an abstract representation of something, whereas an object is a usable example of the thing the class represents.
Objects/Classes and Methods in Visual Basic
Methods – Functions
Methods are operations that can be performed on data. A method may take some input values through its parameters and may return a value of a particular data type. There are two types of methods in VB: Sub Procedures and Functions.
For this Unit, we will discuss two built in classes with built in Functions:
The Math and String classes.
Math Class Functions
The Math class provides programmers with numerous built-in functions.
We will only look at a few of these functions.Abs(num)
Returns the absolute value of a positive or negative number
Sqrt(num) Returns the square root of a number
Sign(num) Returns the sign of a number
Round (num, places) Returns number nearest to the specified value.
Image taken from: http://www.amazingclassroom.com/templates/blue_business/math_1.asp?cag=sample1
Using Abs(num)
The Abs() function returns the absolute value of the number and works with the following data types: Decimal, Double, Integer, SingleAbs() Function intNum Value
after execution
intNum = Math.Abs(4) 4
sngNum = Math.Abs(-4.123)
4.123
intNum = Math.Abs(0) 0
Image taken from: http://withlovero.com/2012/05/15/absolute-value-17-2/
Using Sqrt(num)
Sqrt(num) Returns the square root of a number as a double
Sqrt() Function dblNum Value after execution
dblNum = Math.Sqrt(4)
2.0
dblNum = Math.Sqrt(0)
0.0
dblNum = Math.Sqrt(-4)
NaN (not a number)(NaN represents a value that is not a number)
Image taken from: http://keep3.sjfc.edu/students/anb02630/e-port/vsg/virtual%20strudy%20guide%2021.html
Using Sign(num)
The Sign() function works with the following data types: Decimal, Double, Int16, Int32, Int64, SByte, Single
Sign() Function intNum Value after execution
intNum = Math.Sign(4)
1
intNum = Math.Sign(-4)
-1
intNum = Math.Sign(0)
0
Image taken from: https://www.honors.umass.edu/event/last-day-adddrop
Round Function
The Round() function works with either a decimal or a double. The variable/value that represents the number of places should be an Integer.
Round() Function dblNum Value after execution
dblNum = Math.Round(5.23651, 2)
5.24
decNum = Math.Round(5.23651)
5.0
dblNum = Math.Round(5.5) 6.0
decNum = Math.Round(5.225, 2)
5.23
Note that 5 does round up here.
More info?
This PowerPoint provided an overview of several methods in the Math class in Visual Studio.
For more information on this topic http://msdn.microsoft.com/en-us/library/32s6akha(v=
VS.90).aspx http://msdn.microsoft.com/en-us/library/system.math.
aspx
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