Can you tell the mistake in the code , in one test case it is giving error

#1

import java.util.*;
public class Main {
public static void main(String[] args) {
Scanner scn = new Scanner(System.in);
long n = scn.nextLong();
String m = scn.next();
long temp = 0, num = 0;
for (int i = m.length() - 1; i >= 0; i–) {
char ch = m.charAt(i);
num += Integer.parseInt(ch + “”) % n * (long) Math.pow(10, temp) % n;
num %= n;
temp++;
}
System.out.println(gcd(n, num));

}

public static long gcd(long a, long b) {

	if (b == 0)
		return a;

	return gcd(b, a % b);
}

}

#2

@ritik hey you have to also check the condition when a <b so you have to swap them if this condition is there.

#3

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