Two loops into Recursive

[sr2cute702]

Hello,

I was trying to convert these nested loops into a recursion form, this is my first time and i need assistance.

    		 for (i = 0; i < 2 * n ; i++)
    			 for (j = 0; j < n; j++)
    					counter++;

// into recursion.

 void TwoLoopS(int &count , int n, int i, int j)
 {
     if (i < 2 * n)
     {
         count++;
         TwoLoopS(count, 2 * n, i++, j);
         
         if (j < n)
         {
            count++;
            TwoLoopS(count, n - 1, i, j++);
         }
         
     }
     else
     {
            return;
     }
    	
 }

[salem c]

Something like

if ( i < 2*n ) {
  if ( j < n ) {
    count++;
    j++;
  } else {
    j = 0;
    i++;
  }
  // recurse
}

[JLBorges]

#include <iostream>
#include <iomanip>

int loop( int counter, int j )
{
    if( j <= 0 ) return counter ;
    else return loop( counter+1, j-1 ) ;
}

int outer_loop( int counter, int n, int i )
{
    if( i <= 0 ) return counter ;
    else return outer_loop( loop( counter, n ), n, i-1 ) ;
}

int main()
{
    for( int n = 0 ; n < 15 ; ++n )
    {
        std::cout << std::setw(2) << n << " : " ;

        int counter = 1000 ;

        std::cout << counter + 2*n*n << ' '
                  << loop( counter, 2*n*n ) << ' '
                  << outer_loop( counter, n*2, n ) << ' ' ;

        for( int i = 0; i < 2*n ; ++i )
            for( int j = 0; j < n ; ++j ) ++counter ;
        std::cout << counter << '\n' ;
    }
}

http://coliru.stacked-crooked.com/a/b5cf1c09604f5576