Rust Functions: How to Define, Call, and Use Them Effectively

In Rust, functions are fundamental building blocks of code. They enable you to encapsulate and reuse code, making your programs modular and maintainable. Functions in Rust are declared using the fn keyword, followed by the function name, a parenthesized list of input parameters, a return type (if applicable), and a code block enclosed in curly braces.

To call a function, use the function name followed by a parenthesized list of arguments matching the function's input parameters.

Rust enforces strict type checking, so the input parameters and return type must be explicitly specified.

In this code example, we define a function called add that takes two i32 input parameters and returns their sum as an i32. In the main function, we call the add function with the arguments 5 and 10 and store the result in a variable called result. Finally, we print the result using the println! macro.