Looping

For repeating pieces of code, Rust has the common while loop, again without parentheses around the condition:

// from Chapter 3/code/loops.rs 
fn main() { 
  let max_power = 10; 
  let mut power = 1; 
    while power < max_power { 
        print!("{} ", power); // prints without newline 
        power += 1;           // increment counter 
    } 
} 

This prints the following output:

1 2 3 4 5 6 7 8 9

To start an infinite loop, use the loop statement, as shown below:

loop { 
        power += 1; 
        if power == 42 { 
            // Skip the rest of this iteration 
        continue; 
        } 
        print!("{}  ", power); 
        if power == 50 { 
           print!("OK, that's enough for today"); 
        break;  // exit the loop 
        } 
} 

All the power values including 50 but except 42 are printed; then the loop stops with the statement break. The value 42 is not printed because of the continue statement. So, loop is equivalent to a while true and a loop with a conditioned...