CODEWITHSUNDEEP
rust
KiYugadgeter
KiYugadgeter

Reputation: 4004

Is there a way to catch "division by zero" errors without checking in advance?

How to catch zero division errors without checking in advance?

In python, It is able to with try..except.

num1 = 3
num2 = 0
try:
    num1 / num2
    """
        I know that it should be check before divide but I want to do 
        without check in advance.
    """
except ZeroDivisionError:
    print("Divided by zero")

I understand that checking the divisor is better.
But I am looking for a way to without checking in advance in Rust.
How do I do this?

Upvotes: 8

Views: 8622

Answers (1)

E_net4
E_net4

Reputation: 29972

The safest choice is to use one of the various checked_div functions, which return an Option<{number}>.

fn do_calculation() -> Result<i32, &'static str> {
    let num1 = 2;
    let num2 = 0;
    num1.checked_div(num2)
        .ok_or_else(|| {
            // produce some error value, using &'static str merely to reduce boilerplate
            "division by zero"
        })
}

Then at the called site, one would have the equivalent of the catch clause:

do_calculation().unwrap_or_else(|e| {
    eprintln!("Oh no! {}", e);
});

These functions are still roughly equivalent to checking the divisor for 0 before performing the division proper.

See also:

Upvotes: 17

Related Questions