rustHow to define error in Rust

Error in Rust is defined using the Result type, which is an enum that can either be Ok or Err. Ok is used to indicate success, while Err is used to indicate an error.

Code example:

fn divide(x: i32, y: i32) -> Result<i32, &'static str> {
    if y == 0 {
        return Err("Cannot divide by zero!");
    }
    Ok(x / y)
}

Output

Result<i32, &'static str>

Explanation of code parts:

1. fn divide(x: i32, y: i32) -> Result<i32, &'static str>: This defines a function called divide that takes two i32 parameters and returns a Result type with an i32 type for Ok and a &'static str type for Err.

2. if y == 0 { return Err("Cannot divide by zero!"); }: This checks if the second parameter is equal to zero, and if it is, it returns an Err with the message "Cannot divide by zero!".

3. Ok(x / y): This returns an Ok with the result of the division of the two parameters.

Helpful links:

1. Rust Documentation - Error Handling
2. Rust Documentation - Result

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