take the ceiling of a number in rust

To take the ceiling of a number in Rust, you can use the ceil method provided by the f64 (64-bit floating point number) type. Here is an example:

main.rs
fn main() {
    let x = 3.14_f64;
    let y = x.ceil(); // y is now 4.0

    println!("The ceiling of {} is {}", x, y);
}
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In this example, we create a variable x which holds the value 3.14. We then call the ceil method on x, which returns the smallest integer greater than or equal to x. The resulting value is stored in y, and we print out the original value of x and the computed ceiling value y.

Note that the ceil method is only available on floating point types such as f64, f32, etc. If you need to take the ceiling of an integer value, you can simply cast it to a floating point type first:

main.rs
fn main() {
    let x = 5_i32;
    let y = x as f64; // cast x to f64
    let z = y.ceil() as i32; // ceiling of y, cast back to i32

    println!("The ceiling of {} is {}", x, z);
}
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In this example, we cast the integer value 5 to a floating point value y, take the ceiling of y using the ceil method, and then cast the resulting floating point value back to an integer z. The final result is printed out using println!.