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576 B
576 B
prev_prime
Instructions
Write a function that returns the first prime number that is equal or inferior to the int passed as parameter.
If there are no primes inferior to the int passed as parameter the function should return 0.
Expected function
pub fn prev_prime(nbr: u64) -> u64 {
}
Usage
Here is a possible program to test your function :
fn main() {
println!("The previous prime number before 34 is: {}", prev_prime(34));
}
And its output :
$ cargo run
The previous prime number before 34 is: 31
$