OJ Board

RUNTIME ERROR
why i get runtime error ?
import java.util.Scanner;

class main {

static int Rev(int n){
int x=n;
int k,j=0;
while(x!=0){
k=x%10;
j=j*10+k;
x/=10;
}
return j;

}
static boolean isPrime(int n){
for(int i=2;i<=Math.sqrt(n);i++){
if(n%i==0){
return false;
}
}
return ...

why i get runtime error?

import java.util.Scanner;

public class uv2a10235 {

static int Rev(int n){
int x=n;
int k,j=0;
while(x!=0){
k=x%10;
j=j*10+k;
x/=10;
}
return j;

}
static boolean isPrime(int n){
for(int i=2;i<=Math.sqrt(n);i++){
if(n%i==0){
return false;
}
}
return true ...