C Programming Homework Help Needed

[Pat McCarthy]

This code is supposed to convert a base 10 number, 123, into binary and display the value. Somewhere in the conversion, the division loop stops before it should, for a reason that I cannot identify.
Output with some diagnostic print statements attached.

/* Patrick McCarthy */

#include <stdio.h>
#include <math.h>

void base_convert(int base);
void convert_to_binary(int base, int number);
void divide(int D, int N, int *pq, int *pr);

int main(void)
{
	int base;
	int base_error;

	/* Gets the base from user and validates the value */
	do{
		base_error = 0;

		/* Collects base value from user */
		printf("Please enter an integer between 2 and 10 =>");
		fflush(stdin);
		scanf("%d",&base);

		/* Validate entry */
		switch (base)
		{
			case 2:
			case 3:
			case 4:
			case 5:
			case 6:
			case 7:
			case 8:
			case 9:
			case 10:
				break;
			default:
				base_error = 1;
				printf("Invalid entry\n");
		}
	}
	while(base_error);

	/* Finds base N value of NUMBER */
//	base_convert(base);

	/* Converts number to Binary */
	convert_to_binary(base, 123);

	return 0;
}

void base_convert(int base)
{
	int i;
	int new[3];
	int NUMBER[3];
	int answer;

	//The base 10 number to be converted
	NUMBER[0] = 3;
	NUMBER[1] = 2;
	NUMBER[2] = 1;

	for(i = 0; i < 3; i++)
	{
		new[i] = ( NUMBER[i] * pow(base,i) );

		// Diagnostic
//		printf("i = %d; NUMBER[i] = %d; new[i] = %d\n", i, NUMBER[i], new[i]);
	};

	answer = new[0] + new[1] + new[2];

	printf("%d%d%d(Base 10) = %d(Base %d)", NUMBER[2],NUMBER[1],NUMBER[0],answer, base);

	return;
}

void convert_to_binary(int base, int number)
{
	int j,h;
	int q[16];
	int r[16];

	q[0] = number;

	for(j = 1; q[j] >= 0; j++)
	{
		printf("j=%d\n",j);
		divide(base, q[j-1], &q[j], &r[j]);
	}

	for(h = j; h <= 0; h--)
	{
		printf("%d", r[h]);
	}
}

void divide(int D, int N, int *pq, int *pr)
{
	int q,r;

	q = N / D;
	r = N % D;
	
	printf("Quotient: %d\nRemainder: %d\n\n", q,r);

	*pq = q;
	*pr = r;
}