Question

How to check whether a given number is a Harshad number in Rust

Answer 1

// Harshad number = is an integer that is divisible by the sum of its digits

fn is_harshad_number(n: i32) -> bool {
    let mut sum = 0;
    let mut temp = n;

    while temp > 0 {
        let reminder = temp % 10;
        sum += reminder;
        temp /= 10;
    }

    n % sum == 0
}

fn main() {
    let n = 171;

    // 1 + 7 + 1 = 9 : 171 % 9 = 0 <- Harshad number   

    if is_harshad_number(n) {
        println!("{} is a Harshad number", n);
    } else {
        println!("{} is not a Harshad number", n);
    }
}

 
 
/*
run:

171 is a Harshad number

*/

 

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