C语言中的无重复随机数的代码哪里错了

int main30()
{

srand((unsigned int)time(NULL));

int arr[6] = { 0 };
int i = 0;
int value = 0;



for (i = 0; i < 6; i++)
{
aa:
    value = rand() % 32 + 1;

    for (int j = 0; j <= i; j++)
    {

        if (arr[j] == value)
        {
            goto aa;
        }
        
    }
        
    arr[i] = value;
    printf("%d\n",arr[i]);

}





return 0;

}

j <= i改为 j<i