Functions play a crucial role in Rust code, and the main function serves as the entry point for many programs. In Rust, the fn keyword is used to declare new functions. The conventional style for function and variable names in Rust is snake case, where all letters are lowercase, and underscores separate words.
Let's consider a simple example:
Rust
fn main() {
println!("Hello, world!");
another_function();
}
fn another_function() {
println!("Another function.");
}In this example, we define a function named another_function, and it is called from within the main function. The order of function definitions in the source code does not matter; Rust only requires that functions be defined somewhere in a scope that can be seen by the caller.
