#include <stdio.h>

void reverse ( int* ip_array, int st_pos, int ed_pos )
{
	if ( ( ip_array ) && ( st_pos < ed_pos ) ) {
		* ( ip_array + st_pos ) ^= * ( ip_array + 
ed_pos ) ^= * ( ip_array + st_pos ) ^= * ( ip_array + 
ed_pos );
		reverse ( ip_array, ++st_pos, --ed_pos );
	}
}

int main ( int argc, char* argv [] )
{
	int int_array [20];
	int number = 789876;
	int counter = 0;
	int nloop = 0;
	int start_pos = 2;
	int end_pos = 5;

	/* split the number into an array */
	while ( number ) {
		int_array [ counter++ ] = number % 10;
		number = number / 10;
	}

	/* reverse the splited array */
	reverse ( int_array, 0, counter - 1 );

	/* reverse for the particular position */
	if ( ( start_pos < end_pos ) && ( end_pos <= 
counter ) ) {
		reverse ( int_array, ( start_pos - 1 ), ( 
end_pos - 1 ) );
		
		number = 0;
		for ( nloop = 0; nloop < counter; nloop++ )
		{
			number *= 10;
			number += int_array [ nloop ];
		}

		printf ( "\n %d", number );
	}

	return ( 0 );
}