/*
 * PR1TON -- use indirect recursion to print the integers
 * from A to B
 *
 * Matt Bishop, ECS 36A
 *
 * April 30, 2024
 *      -- original program written
 */

#include <stdio.h>

/*
 * macros
 */
#define A 1
#define B 6

/*
 * prototypes
 */
void fun2(int, int);

/*
 * first function: print, increment, call second function
 */
void fun1(int n, int N)
{
	/* if n (current int) is over the top N, skip what follows */
	if (n <= N){
		printf("%d ", n);	/* print integer */
		n++;			/* go to next integer */
		fun2(n, N);		/* call second function */
	}
}

/*
 * second function: print, increment, call first function
 */
void fun2(int n, int N)
{
	if (n <= N){
		printf("%d ", n);	/* print integer */
		n++;			/* go to next integer */
		fun1(n, N);		/* call second function */
	}
}

/*
 * main function
 */
int main(void)
{
	/* print away! */
	fun1(A, B);
	putchar('\n');

	/* phew -- glad that's over */
	return(0);
}