recursion: print from 1 to n

[Fendel Coulptz]

Hello,
as you all can see im very new to java and recursion here...

"Given an integer n, write recursive function that prints 1 through n"

i can easily do it with a method with 2 variables, eg. display(int m, int n),

but how can i do it with only a single variable? eg. display(int n)

thanks.

[Francis Siu]

hi
i can easily do it with a method with 2 variables, eg. display(int m, int n),
Could you post the program here? As we know, you can do with 2 variables, some edit are needed to do with only one variable.
Following structure is used for writing recursion

 
int rec(1-2 parameters)
{
  if(stopping condition)
    return stopping value;
  // second stopping condition if needed
  return value/rec(revised parameters) 
  +-*/ rec(revised parameters);
}
 

HTH

[Fendel Coulptz]

oops sorry i meant parameters not variables so sorry

method is display(int m, int n)

so to print "12345678910" from one to 10 is display(1,10)

[Elouise Kivineva]

I don't see the answer either.
Are you sure you aren't supposed to print numbers from n to 0?

[Joyce Lee]

Hi Fendel,
but how can i do it with only a single variable? eg. display(int n)

  
public class RecursiveTest {
    public static void main(String[] args) {
        display(10);    
    }
    
    // print 1 to n
    private static void display(int n) {
        if (n > 1) {
            display(n - 1);
        }
        System.out.println(n);
    }
}

Joyce

[Fendel Coulptz]

thank you

[Layne Lund]

I think this is called "tail recurssion". You should be able to easily revise it to use so-called "head recurssion" in order to print the numbers from n down to 1.