Rust

2.6    Solutions

This section provides the code solutions for the practice exercises in Section 2.5. The code is largely self-explanatory; however, we have included comments and additional explanations wherever necessary to enhance understanding.

1. Correctly defining variables

   fn main(){    let my_age  = 40;    println!("My age is: {}", my_age); }  

2. Checking mutability

   fn main(){    let x1 = 40;    let mut x2 = x1;    x2 = x1-2;    println!("x1 is: {} and x2 is: {}", x1,x2);}/* Note: There will be a warning when you execute that the value of x2 has been immediately overwritten before being read. You may just ignore it otherwise add the line #![ allow(unused)] at the top before the fn main() if you do want to see the warning. */  

3. Mutability of variables

   fn