1. Objective 7.03 Apply Built-in Math Class Functions
Computer Programming I
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2. 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.

3. 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.

4. 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.
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5. Using Abs(num)
The Abs() function returns the absolute value of the number and works with the following data types:
Decimal, Double, Integer, Single
Abs() Function
intNum Value after execution
intNum = Math.Abs(4) 4
sngNum = Math.Abs(-4.123)
4.123
intNum = Math.Abs(0)
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6. 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)
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7. 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)
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8. 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( , 2)
5.24
decNum = Math.Round( )
5.0
dblNum = Math.Round(5.5)
6.0
decNum = Math.Round(5.225, 2)
5.23
Note that 5 does round up here.

9. More info?
This PowerPoint provided an overview of several methods in the Math class in Visual Studio.
For more information on this topic