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Solution Review 2: Count Iterations of a Loop Until a Condition

Understand how to implement and count iterations within a while loop in Rust by using mutable variables and loop conditions. This lesson helps you grasp controlling loop execution and tracking iteration counts in Rust programming.

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Solution:

Rust 1.40.0
fn test(mut x:i32) {
    // define a mutable variable
    let mut count = 0;
    // define a while loop
    while x >= 0 { 
       x = x - 3; // decrement the value of x by 3
       count = count + 1;
    }
    println!("{}", count);
}
fn main(){
    print!("Iterations when x = 21 :");
    test(21);
    print!("Iterations when x = 33 :");
    test(33);
}

Explanation

  • On line 3, a mutable variable count is initialized with 0.
  • while
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