Variables
int number = 1;
Variables are named objects of a specified data type that we can assign a value to.
Usage
Declaring Variables
Declaring (or defining) a variable means giving it a name. You can declare a variable this way:
Initializing Variables
Initializing a variable means giving it an initial value.
We can do just that with the =
sign:
Data Types
Each variable has a Data Type (also known as a primitive), such as...
Name | Description | Example Value |
| Default data type. The compiler will assume the most likely data type. | 5 20.3f true |
| Integer. A whole number between -2147483648 and 2147483647. | 24 |
| Floating-point. A decimal between 1.175494351 E - 38 and 3.402823466 E + 38. | 24.01f |
| Boolean. A true or false value. Can also be represented by 1 or 0. | true 1 |
You can initialize a variable with a specific data type if you want:
In most cases, the compiler will assume a number is an int
.
You can put an f
after any number to show that it's a float
, even without a decimal point:
Conclusion
Now you know how to save whole numbers, decimals, and true/false values and refer to them by name. This will be very useful for re-using values in mathematic expressions and procedures.
With that in mind, you're ready to learn about a major component of procedures and variables.
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