Why doesn't CodeB prints 42 while CodeA does print 42?

I'm a beginner. I solved the 1st classical on Spoj. But the first code i wrote couldn't solve the exercise because 42 is included in the output. The second code solved the problem because it doesn't print 42. But i still can't figure out how it works. Why does Code A prints 42 and why doesn't Code B? Please help me out!

Code A

public class CodeA {
    public static void main(String[]args) {
        Scanner input = new Scanner(System.in);
        int n = 0;
        while(true) {
            if(n!=42) {
               n = input.nextInt();               
               System.out.println(n);
            }
            else{
                break;
            }
       }
   }
}

Code B

public class CodeB {  
    public static void main(String[]args) {

       Scanner in = new Scanner(System.in);

       while(true) {
          int n = in.nextInt();
          if(n == 42) {
            break;
          }
          System.out.println(n);
       }
    }
}