VB variables refer to the amount whose value can be changed at runtime. Unlike constants, variables can be assigned multiple times, so this variable is often used to save temporary data in programs. Variables are used very frequently in programs, and you should be proficient in the declaration and use of variables.
VB variable type (recommended learning: web front-end video tutorial)
1. Numeric data type
1, Integer (type symbol %)
Integer refers to an integer between -32768 and 32767. Usually this range covers most of the possible uses to the number. If you think the number you want to use may exceed this range, you can consider defining it as Long.
2. Long (type symbol &)
This data type is sometimes called Long Integer. This data type can handle all numbers between -2147483648 and 2147483647. Unlike Integer which uses 2 bytes, it uses 4 bytes of memory to store data.
3. Single (type symbol!)
Single is suitable for numbers that require decimal points. Single can handle negative values between -3.402823E38 and -1.401298E-45 and positive values between 1.401298E_45 and 3.402823E38.
4. Double (type symbol #)
This data type requires 8 bytes of memory to store data. This data type is useful if you must deal with very large ranges of values.
5. Currency (type symbol @)
This data type is mainly suitable for currency values. It requires 8 bytes of memory to store data. This data type has a fixed number of decimal places (4 digits).
2. Byte data type
In some cases, you may need to access data in the form of a single byte. In this case, you need to use the Byte data type. It mainly includes integers between 0 and 255. The Byte data type is commonly used to access binary files, graphics and sound files.
3. String data type (type symbol $)
String data is only used to store strings.
4. Boolean data type
The value of this data type can only be True or False. For Visual Basic, the False keyword represents a zero value and True represents a non-zero value.
5. Date data type
This data type refers to numeric or string data that can be converted into a valid date.
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