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Recursion

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Join Date: Apr 2004

Posts: 353

Reputation: Asif_NSU is on a distinguished road

Solved Threads: 2

Asif_NSU

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Posting Whiz

Re: Recursion

Jun 5th, 2004

I was trying to do some simple exercises on recursive functions:

1. Write a function using Recursion to print numbers from n to 0.

My solution:

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 C Syntax (Toggle Plain Text) 
int integer(int n)
{
      if(n>=0)
      {
           printf("\n%d",n);
           integer(--n);
       }
}
int integer(int n)
{
      if(n>=0)
      {
           printf("\n%d",n);
           integer(--n);
       }
}

The next exercise was

2. Write a function using Recursion to print numbers from 0 to n. (You just need to shift one line in the program of problem 1.)

Well i dont know how to do it using recursion; at least not by shifting just one line of the previous code. And also did not want to use any other variables.
Is there any simple solution to the 2nd problem. Help me out?

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Join Date: Apr 2004

Posts: 4,311

Reputation: Dave Sinkula has a brilliant future

Solved Threads: 228

Dave Sinkula Dave Sinkula is offline

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long time no c

Re: Recursion

Jun 5th, 2004

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(Toggle Plain Text)

#include <stdio.h> 

void foo(int n)
{
   if ( n >= 0 )
   {
	  printf("%d ", n);
	  foo(n - 1);
   }
}

void bar(int n)
{
   if ( n >= 0 )
   {
	  bar(n - 1);
	  printf("%d ", n);
   }
}

int main() 
{
   int value = 5;
   foo(value); putchar('\n');
   bar(value); putchar('\n');
   return 0; 
}

/* my output
5 4 3 2 1 0 
0 1 2 3 4 5 
*/

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