Difference between revisions of "Data Type"
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|string name = “John Doe”; | |string name = “John Doe”; | ||
|// strings are typically used to store information such as names, addresses, etc. because they can hold text. | |// strings are typically used to store information such as names, addresses, etc. because they can hold text. | ||
| + | |- | ||
| + | |string jobTitle = "Sales Associate"; | ||
|- | |- | ||
|bool isStudent= true; | |bool isStudent= true; | ||
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|int age = 20; | |int age = 20; | ||
| − | |// an int (short for integer) can only be whole | + | |// an int (short for integer) can only be a whole number. Since we typically say age as a whole number, we're using an int |
|- | |- | ||
|float payrate= 12.50f; | |float payrate= 12.50f; | ||
| − | |// unlike integers, a float (short for floating-point number) can hold more complex numbers with decimal places. | + | |// unlike integers, a float (short for floating-point number) can hold more complex numbers with decimal places. A nice fit for our student's payrate! |
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|} | |} | ||
Revision as of 15:39, 19 June 2019
Contents
Definition
A data type is an attribute of data that tells the compiler how the programmer intends on using the data. A data type limits the values that an expression might take.
Relevance
Explanation
Information falls under a different data type. Different data types are used for different intents: for math you may use integers, floats, doubles, etc. while for keeping a contact list, strings would be more appropriate. As mentioned before, data types limit which operations can be used on them. A string cannot be added to an integer because an integer can only be a whole number while a string can be a name, address, etc. However, an integer can be added to a string, this is known as Concatenation. It’s all about using the right data type for the right job.
Example
Here's an example of a few different types of variables being initialized along with a few Comments
| string name = “John Doe”; | // strings are typically used to store information such as names, addresses, etc. because they can hold text. |
| string jobTitle = "Sales Associate"; | |
| bool isStudent= true; | // booleans can only be true or false. Great use in conditional statements! |
| int age = 20; | // an int (short for integer) can only be a whole number. Since we typically say age as a whole number, we're using an int |
| float payrate= 12.50f; | // unlike integers, a float (short for floating-point number) can hold more complex numbers with decimal places. A nice fit for our student's payrate! |
