Thread: do-while loop doesn't work

for some reason my do-while implementation doesn't work. here is my code:

Code:

#include <stdio.h>

char getAns (char mesg[])
{
	char ans;
	printf ("&#37;s", mesg);
	ans = getchar();
	getchar();
	return toupper(ans);
}

void swap(int *p, int *q)
{
    int tmp;
	
    tmp = *p;
    *p = *q;
    *q = tmp;
}

void bubble (int a[], int N)
{
	int i, j;
	
	for (i = 0; i < N; i++)
		for (j = N - 1; i < j; j--)
		if (a[j - 1] > a[j])
			swap(&a[j - 1], &a[j]);
}

int	main (void)
{	
	char ans;
	int i, N;
	int a[N + 1];
	do
	{
	printf ("Enter the amount of numbers to be sorted: ");
	scanf ("%d", &N);
	printf("Now enter the numbers:\n");
	for (i = 0; i < N; i++){
		scanf ("%d", &a[i]);}
	bubble (a, N);
	for (i = 0; i < N; i++)
	printf("%d ", a[i]);
	printf("\nYour numbers were sorted using BubbleSort.\n");
	ans = getAns ("\nSort again (Y/N) ?");
	} while (ans == 'Y');
	return 0;
}

thanks for any suggestions