[Super Simple VB Intro] 8. Four Types of Operations

Preface

These past few days it seems a lot of students have been reading this VB tutorial series. A little classmate said it was pretty well written hehe, so I've got the motivation to keep updating. Just a heads-up, it's being updated on both the WeChat official account and the blog at the same time, and because the blog can be written in Markdown, the layout is a bit more comfortable. If it's convenient, I suggest you read it on the blog. Blog address: blog.deali.cn

Arithmetic Operations

Arithmetic operations include addition (+), subtraction (-), multiplication (*), division (/), integer division () (e.g. 7\2 equals 3), modulo (Mod) (used to get the remainder, e.g. 7Mod2 equals 1, because 7=3 x 2 + 1, so the remainder is 1, this seems to be middle school math knowledge = =..), exponentiation (^), and unary minus (negating a number; two negatives make a positive, e.g. - (-6) equals 6).

Concatenation Operations

Concatenation operations join two character expressions together to produce a new string. There are two concatenation operators: + and &.

• When using the & operator, the two expressions being concatenated do not both have to be strings; that is, the & operator can forcibly concatenate the two expressions as strings. For example:

Dim intNum As Interger
Dim strTemp As String
intNum = 22
strTemp = "学号是" & intNum 

• When using the + operator, the operands must be strings; otherwise, an error is produced. The following code is incorrect!

Dim intNum As Interger
Dim strTemp As String
intNum = 22 
strTemp = "学号是" + intNum

You might not feel much after reading this, but later in development, the & operator is extremely useful, and really handy.

Relational Operations

Relational operations are used to compare the magnitude of two expressions, including greater than (＞), greater than or equal to (＞＝), less than (＜＝), less than or equal to (＜＝), equal to (＝), and not equal to (＜＞). The result of a relational operation is the logical value True or False. Here are a few small examples; see the table below:

Logical Operations

Logical operations are also called Boolean operations, specifically used for operations between logical values. See the table below:

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Blog address: blog.deali.cn