T100.java

import java.util.Scanner;
/*
*@author Nitish Kumar Singh
*/
class T100{
  public static void main(String args[]){
    Scanner obj = new Scanne(System.in);
    int n,m ;
    System.out.println("Entre the value");
    int a = obj.nextInt();
    // This will be excuted only when a is either 1 or 2
    if(a==1){
      n=10;
    }else if(a==2){
      n=20;
    }else{
      n=0; // initialise n here to use further 
    }
    /*
    *Suppose a is neither 1 nor 2 in that case , n is uninitialise . 
    * So for that you have to initialise n before you used that here.
    * by using else you can solve that problem
    */
    m=n+a;
    System.out.prinln(m);
  }
}