rust armanriazi error panicked thread 'main' panicked at 'attempt to subtract with overflow

The error message you provided indicates that there was an attempt to subtract with overflow in a Rust program. This error occurs when the result of a subtraction operation exceeds the maximum or minimum value that can be represented by the data type being used.

To resolve this error, you can consider using a different data type that can accommodate the larger range of values. For example, if you are using an integer data type like u8 (8-bit unsigned integer) or i32 (32-bit signed integer), you may want to switch to a larger data type such as u16 or i64 respectively.

If changing the data type is not an option, you can handle the potential overflow by checking for it before performing the subtraction. You can use the checked_sub method provided by Rust's standard library. This method returns an Option type, which allows you to handle the case where an overflow would occur.

Here's an example of how you can use the checked_sub method:

fn main() {
    let a: u8 = 10;
    let b: u8 = 20;

    match a.checked_sub(b) {
        Some(result) => {
            println!("Subtraction result: {}", result);
        }
        None => {
            println!("Subtraction overflowed!");
            // Handle the overflow case here
        }
    }
}

In this example, the checked_sub method is used to subtract b from a. If the subtraction does not result in an overflow, the Some variant is returned with the result. If an overflow occurs, the None variant is returned, and you can handle the overflow case accordingly.

By using the checked_sub method or changing the data type, you can avoid the "attempt to subtract with overflow" error in your Rust program.