Code shared from the Rust Playground

playground.rs

// type inference

fn main() {
    let val1: u32 = 42;
    //        ^^^ type specified explicitly
    
    let val2 = 42;
    //      ^ type inferred
         
    let val3: u32 = "42".parse().unwrap();
    //        ^^^ parse method uses the type for conversion - c++ can't do this
           
    let val4 = "42".parse::<u32>().unwrap();
    //      ^ no type    ^^^^^^^ 'turbofish' syntax to mention type 
    
    println!("val {} {} {} {}", val1, val2, val3, val4);
}