I cannot find what is wrong with my code. please help

Question

I am fairly new in java and it seems like the compiler thinks In is a variable? please help

import java.text.*;
import java.io.*;
public class JavaApplication2 {
public static void main (String[] args) {
int num = In.getInt ();
int[] arr = new int [9];

int sum = 0, sum1 = 0, sum2 = 0;

for (int i = 8 ; i >= 0 ; i--)
{
arr [i] = num % 10;
num /= 10;
System.out.println(arr[i]);

}

for (int i = 0 ; i <= 8 ; i += 2)
{
arr [i] += sum2;

}
for (int i = 1 ; i <= 8 ; i += 2)
{
arr [i] *= 2;
arr [i] += sum;
System.out.println(arr[i]);
}

if (10 - ((sum + sum2) % 10) != arr [8])
System.out.println ("Not Valid");
else
{
System.out.println ("Valid");
}
}
}

File: /Users/r/JavaApplication2.java [line: 6]
Error: /Users/r/JavaApplication2.java:6: cannot find symbol
symbol : variable In
location: class JavaApplication2

Answer 1

//problem in getting/reading number
import java.text.*;
import java.io.*;
import java.util.Scanner ;
public class JavaApplication2 {
public static void main (String[] args){
Scanner sc= new Scanner(System.in);
int num = sc.nextInt();
int[] arr = new int [9];

int sum = 0, sum1 = 0, sum2 = 0;

for (int i = 8 ; i >= 0 ; i--)
{
arr [i] = num % 10;
num /= 10;
System.out.println(arr[i]);

}

for (int i = 0 ; i <= 8 ; i += 2)
{
arr [i] += sum2;

}
for (int i = 1 ; i <= 8 ; i += 2)
{
arr [i] *= 2;
arr [i] += sum;
System.out.println(arr[i]);
}

if (10 - ((sum + sum2) % 10) != arr [8])
System.out.println ("Not Valid");
else
{
System.out.println ("Valid");
}
}
}