All your logic must be contained in the "main" function, which looks like this:
```cpp
main = Func(): Int {
}
```
This is how you define functions. In this example, "main" is the name of the function, and `Int` is the return type. My function takes no arguments.
If I wanted to make a function that takes arguments, it might look like this:
```cpp
add = Func(number1: Int, number2: Int): Int {
return number1 + number2
}
```
This is a function that adds two numbers together, here's the same function in Python:
```py
def add(number1: int, number2: int) -> int:
return number1 + number2
```
### Calling Functions
To call a function, you type a dollar sign (the $ symbol), then the name of the function, and then you pass any of your arguments inbetween paranthesis, like this:
```cpp
add = Func(number1: Int, number2: Int): Int {
return number1 + number2
}
...
later in my code...
...
$add(9, 10);
```
Here's a "Hello, World!" program in Plasma:
```cpp
main = Func(): Int {
$print("Hello, World!\n");
}
```
`print` is a builtin function, it's defined in every piece of code you write. It has the same formatting as the `printf` function in C, so if I wanted to print an integer I could do it like so:
```cpp
$print("%i\n", 123);
```
## Variables
To create a variable, it's as simple as:
```cpp
name: Type = value;
```
There are several types in Plasma, which are: `Int`, `Float`, `Bool`, `String`
Here's another example:
```cpp
name: String = "bob";
age: Int = 23;
```
To change the value of an already defined variable, you just have to provide the name, and then write an equals sign, like this:
