Question

How to check whether a given character is alphanumeric in Rust

Answer 1

fn main() {
    let ch:char = 'A';

    if (ch >= '0' && ch <= '9') ||
       (ch >= 'a' && ch <= 'z') || 
       (ch >= 'A' && ch <= 'Z') {
        println!("Character '{}' is alphanumeric", ch);
    }
    else {
        println!("Character '{}' is not alphanumeric", ch);
    }
}




/*
run:

Character 'A' is alphanumeric

*/

 

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Answer 2

fn main() {
    let char1 = 'A';
    let char2 = '-';
    let char3 = '=';
    let char4 = '8';
    let char5 = '@';
    let char6 = 'c';

    println!("{}", char1.is_alphanumeric());
    println!("{}", char2.is_alphanumeric());
    println!("{}", char3.is_alphanumeric());
    println!("{}", char4.is_alphanumeric());
    println!("{}", char5.is_alphanumeric());
    println!("{}", char6.is_alphanumeric());
}




/*
run:

true
false
false
true
false
true

*/

 

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