recursiontest.java

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public class RecursionTest{
  public static long factor(int n){
  	if(n==0)
  	  return 1 ;
  	else
  	  return n*factor(n-1);  
  }
  public static void main(String args[]){
    int k = 20 ;
    System.out.println(k+"!="+factor(k));	
    System.out.println(Long.MAX_VALUE);	
  }	
}